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  • ZBLLAC: A Spectroscopic Database of BL Lacertae Objects
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-10-14
    Marco Landoni, R. Falomo, S. Paiano, and A. Treves

    This paper describes the database of optical spectra of BL Lacertae (BLL) objects (Z BLL objects) available at https://web.oapd.inaf.it/zbllac/ [https://web.oapd.inaf.it/zbllac/] . At present, it contains calibrated spectra for 295 BLL. For about 35% of them, we report a firm measure of redshift z , while for 35 sources we set a lower limit on z based on the detection of intervening absorption systems

    更新日期:2020-10-16
  • The Sloan Digital Sky Survey Reverberation Mapping Project: the XMM-Newton X-Ray Source Catalog and Multiband Counterparts
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-10-08
    Teng Liu, Andrea Merloni, Torben Simm, Paul J. Green, William N. Brandt, Donald P. Schneider, Tom Dwelly, Mara Salvato, Johannes Buchner, Yue Shen, Kirpal Nandra, Antonis Georgakakis, and Luis C. Ho

    The XMM-RM project was designed to provide X-ray coverage of the Sloan Digital Sky Survey Reverberation Mapping (SDSS-RM) field. Forty-one XMM-Newton exposures, placed surrounding the Chandra AEGIS field, were taken, covering an area of 6.13 deg 2 and reaching a nominal exposure depth of ∼15 ks. We present an X-ray catalog of 3553 sources detected in these data, using a PSF-fitting algorithm and a

    更新日期:2020-10-12
  • Matched Photometric Catalogs of GALEX UV Sources with Gaia DR2 and SDSS DR14 Databases (GUVmatch)
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-10-08
    Luciana Bianchi and Bernard Shiao

    We have matched the ultraviolet (UV) sources in GUVcat _AIS with optical databases that have similar depth and wide sky coverage. GUVcat _AIS has Galaxy Evolution Explorer (GALEX) far-UV (FUV, λ eff ∼ 1528 Å) and near-UV (NUV, λ eff ∼ 2310 Å) photometry of ≈83 million sources, covering 24,788 square degrees of the sky, with a typical depth of FUV = 19.9 and NUV = 20.8 AB mag. Matches with Gaia and

    更新日期:2020-10-12
  • Sub-ion Scale Compressive Turbulence in the Solar Wind: MMS Spacecraft Potential Observations
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-10-08
    Owen Wyn Roberts, Rumi Nakamura, Klaus Torkar, Yasuhito Narita, Justin C. Holmes, Zoltán Vörös, Christoph Lhotka, C. Philippe Escoubet, Daniel B. Graham, Daniel J. Gershman, Yuri Khotyaintsev, and Per-Arne Lindqvist

    Compressive plasma turbulence is investigated at sub-ion scales in the solar wind using both the Fast Plasma Investigation (FPI) instrument on the Magnetospheric MultiScale mission (MMS), as well as using calibrated spacecraft potential data from the Spin Plane Double Probe (SDP) instrument. The data from FPI allow the sub-ion scale region ( f sc ≳ 1 Hz) to be investigated before the instrumental noise

    更新日期:2020-10-12
  • Physics of Eclipsing Binaries. V. General Framework for Solving the Inverse Problem
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-10-08
    Kyle E. Conroy, Angela Kochoska, Daniel Hey, Herbert Pablo, Kelly M. Hambleton, David Jones, Joseph Giammarco, Michael Abdul-Masih, and Andrej Prša

    PHOEBE 2 is a Python package for modeling the observables of eclipsing star systems, but until now it has focused entirely on the forward model—that is, generating a synthetic model given fixed values of a large number of parameters describing the system and the observations. The inverse problem, obtaining orbital and stellar parameters given observational data, is more complicated and computationally

    更新日期:2020-10-12
  • Yonsei Evolutionary Population Synthesis (YEPS) Model. III. Surface Brightness Fluctuation of Normal and Helium-enhanced Simple Stellar Populations
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-10-08
    Chul Chung, Suk-Jin Yoon, Hyejeon Cho, Sang-Yoon Lee, and Young-Wook Lee

    We present an evolutionary population synthesis model of the surface brightness fluctuation (SBF) for normal and He-enriched simple stellar populations (SSPs). While our SBF model for the normal He population agrees with other existing models, the He-rich population, containing hotter horizontal branch stars and brighter red clump stars than the normal He population, entails a substantial change in

    更新日期:2020-10-12
  • The Coronal Global Evolutionary Model: Using HMI Vector Magnetogram and Doppler Data to Determine Coronal Magnetic Field Evolution
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-09-30
    J. Todd Hoeksema, William P. Abbett, David J. Bercik, Mark C. M. Cheung, Marc L. DeRosa, George H. Fisher, Keiji Hayashi, Maria D. Kazachenko, Yang Liu, Erkka Lumme, Benjamin J. Lynch, Xudong Sun, and Brian T. Welsch

    The Coronal Global Evolutionary Model (CGEM) provides data-driven simulations of the magnetic field in the solar corona to better understand the build-up of magnetic energy that leads to eruptive events. The CGEM project has developed six capabilities. CGEM modules (1) prepare time series of full-disk vector magnetic field observations to (2) derive the changing electric field in the solar photosphere

    更新日期:2020-10-02
  • On Neural Architectures for Astronomical Time-series Classification with Application to Variable Stars
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-09-30
    Sara Jamal and Joshua S. Bloom

    Despite the utility of neural networks (NNs) for astronomical time-series classification, the proliferation of learning architectures applied to diverse data sets has thus far hampered a direct intercomparison of different approaches. Here we perform the first comprehensive study of variants of NN-based learning and inference for astronomical time series, aiming to provide the community with an overview

    更新日期:2020-10-02
  • Search for Nearby Earth Analogs .III. Detection of 10 New Planets, 3 Planet Candidates, and Confirmation of 3 Planets around 11 Nearby M Dwarfs
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-09-30
    Fabo Feng, Stephen A. Shectman, Matthew S. Clement, Steven S. Vogt, Mikko Tuomi, Johanna K. Teske, Jennifer Burt, Jeffrey D. Crane, Bradford Holden, Sharon Xuesong Wang, Ian B. Thompson, Matías R. Díaz, and R. Paul Butler

    Earth-sized planets in the habitable zones of M dwarfs are good candidates for the study of habitability and detection of biosignatures. To search for these planets, we analyze all available radial velocity data and apply four signal detection criteria to select the optimal candidates. We find 10 strong candidates satisfying these criteria and three weak candidates showing inconsistency over time due

    更新日期:2020-10-02
  • The 2017 September 6 Flare: Radio Bursts and Pulsations in the 22–5000 MHz Range and Associated Phenomena
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-09-30
    Marian Karlický and Ján Rybák

    For the 2017 September 6 flare (SOL2017-Sep-06T11:53) we present not only unusual radio bursts but also their interesting time association with the other flare phenomena observed in extreme ultraviolet (EUV), white-light, X-ray, and γ -ray emissions. Using our new method based on wavelets we found quasi-periodic pulsations (QPPs) in several locations of the whole time–frequency domain of the analyzed

    更新日期:2020-10-02
  • The Spectroscopic Follow-up of the QUBRICS Bright Quasar Survey
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-09-28
    Konstantina Boutsia, Andrea Grazian, Giorgio Calderone, Stefano Cristiani, Guido Cupani, Francesco Guarneri, Fabio Fontanot, Ricardo Amorin, Valentina D’Odorico, Emanuele Giallongo, Mara Salvato, Alessandro Omizzolo, Michael Romano, and Nicola Menci

    We present the results of the spectroscopic follow-up of the QUasars as BRIght beacons for Cosmology in the Southern Hemisphere (QUBRICS; Calderone et al. 2019) survey. The selection method is based on a machine-learning approach applied to photometric catalogs, covering an area of ∼12,400 deg 2 in the Southern Hemisphere. The spectroscopic observations started in 2018 and identified 55 new, high-redshift

    更新日期:2020-09-29
  • Inference of the Local Interstellar Spectra of Cosmic-Ray Nuclei Z ≤ 28 with the G al P rop –H el M od Framework
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-09-28
    M. J. Boschini, S. Della Torre, M. Gervasi, D. Grandi, G. Jóhannesson, G. La Vacca, N. Masi, I. V. Moskalenko, S. Pensotti, T. A. Porter, L. Quadrani, P. G. Rancoita, D. Rozza, and M. Tacconi

    Composition and spectra of Galactic cosmic rays (CRs) are vital for studies of high-energy processes in a variety of environments and on different scales, for interpretation of γ -ray and microwave observations, for disentangling possible signatures of new phenomena, and for understanding of our local Galactic neighborhood. Since its launch, AMS-02 has delivered outstanding-quality measurements of

    更新日期:2020-09-29
  • AstroSat UVIT Detections of Chandra X-Ray Sources in M31
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-09-15
    D. A. Leahy and Y. Chen

    An ultraviolet (UV) survey of M31 has been carried out during 2017–19 with the Ultra-Violet Imaging Telescope (UVIT) instrument on board the AstroSat Observatory. Here we match the M31 UVIT source catalog with the Chandra source catalog. We find 67 UVIT/Chandra sources detected in a varying number of UV and X-ray bands. The UV and X-ray photometry is analyzed using power-law and blackbody models. The

    更新日期:2020-09-16
  • A Search for Rotation Periods in 1000 TESS Objects of Interest
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-09-09
    B. L. Canto Martins, R. L. Gomes, Y. S. Messias, S. R. de Lira, I. C. Leão, L. A. Almeida, M. A. Teixeira, M. L. das Chagas, J. P. Bravo, A. Bewketu Belete, and J. R. De Medeiros

    The high-quality light curves from the Transiting Exoplanet Survey Satellite (TESS) represent a unique laboratory for the study of stellar rotation, which is a fundamental observable driving stellar and planetary evolution, including planetary atmospheres and impacting habitability conditions and the genesis of life around stars. As of 2020 April 14, this mission delivered public light curves for 1000

    更新日期:2020-09-10
  • Simulating the Cosmic Neutrino Background Using Collisionless Hydrodynamics
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-09-09
    Derek Inman and Hao-Ran Yu

    The cosmic neutrino background is an important component of the universe that is difficult to include in cosmological simulations due to the extremely large velocity dispersion of neutrino particles. We develop a new approach to simulate cosmic neutrinos that decomposes the Fermi–Dirac phase space into shells of constant speed and then evolves those shells using hydrodynamic equations. These collisionless

    更新日期:2020-09-10
  • ALMA High-frequency Long-baseline Campaign in 2017: A Comparison of the Band-to-band and In-band Phase Calibration Techniques and Phase-calibrator Separation Angles
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-09-09
    Luke T. Maud, Yoshiharu Asaki, Edward B. Fomalont, William R. F. Dent, Akihiko Hirota, Satoki Matsushita, Neil M. Phillips, John M. Carpenter, Satoko Takahashi, Eric Villard, Tsuyoshi Sawada, and Stuartt Corder

    The Atacama Large Millimeter/submillimeter Array (ALMA) obtains spatial resolutions of 15 to 5 mas at 275–950 GHz (0.87–0.32 mm) with 16 km baselines. Calibration at higher frequencies is challenging as ALMA sensitivity and quasar density decrease. The band-to-band (B2B) technique observes a detectable quasar at a lower frequency that is closer to the target, compared to one at the target high frequency

    更新日期:2020-09-10
  • Upgraded GMRT Observations of the Coma Cluster of Galaxies: The Observations
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-09-09
    Dharam V. Lal

    We have used the upgraded Giant Metrewave Radio Telescope to map the Coma cluster of galaxies at 250–500 MHz and 1050–1450 MHz bands. These 6.″26 and 2.″18 resolutions observations allow detailed radio structures to be determined of all detected radio sources that show both discrete pointlike and extended morphologies. We present images of a subset of 32 brightest ( S ν ≳ 30 mJy) and dominant sources

    更新日期:2020-09-10
  • Panning for Gold: New Emission Lines from UV–VIS Spectroscopy of Au i and Au ii
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-09-09
    S. J. Bromley, C. A. Johnson, D. A. Ennis, G. J. Hartwell, D. A. Maurer, S. D. Loch, P. C. Stancil, B. M. McLaughlin, C. E. Sosolik, and J. P. Marler

    The recent detection of a neutron star merger by the LIGO collaboration has renewed interest in laboratory studies of r -process elements. Accurate modeling and interpretation of the electromagnetic transients following the mergers requires computationally expensive calculations of both the structure and opacity of all trans-iron elements. To date, the necessary atomic data to benchmark structure codes

    更新日期:2020-09-10
  • The Next Generation Virgo Cluster Survey. XXXIV. Ultracompact Dwarf Galaxies in the Virgo Cluster
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-09-09
    Chengze Liu, Patrick Côté, Eric W. Peng, Joel Roediger, Hongxin Zhang, Laura Ferrarese, Ruben Sánchez-Janssen, Puragra Guhathakurta, Xiaohu Yang, Yipeng Jing, Karla Alamo-Martínez, John P. Blakeslee, Alessandro Boselli, Jean-Charles Cuilandre, Pierre-Alain Duc, Patrick Durrell, Stephen Gwyn, Andres Jordán, Youkyung Ko, Ariane Lançon, Sungsoon Lim, Alessia Longobardi, Simona Mei, J. Christopher Mihos

    We present a study of ultracompact dwarf (UCD) galaxies in the Virgo cluster based mainly on imaging from the Next Generation Virgo Cluster Survey (NGVS). Using ∼100 deg 2 of u * giz imaging, we have identified more than 600 candidate UCDs, from the core of Virgo out to its virial radius. Candidates have been selected through a combination of magnitudes, ellipticities, colors, surface brightnesses

    更新日期:2020-09-10
  • In the Trenches of the Solar–Stellar Connection. I. Ultraviolet and X-Ray Flux–Flux Correlations across the Activity Cycles of the Sun and Alpha Centauri AB
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-09-03
    Thomas R. Ayres

    This study focuses on high-energy proxies of stellar magnetic activity over long-term starspot cycles of three low-activity Sun-like stars: α Centauri A (HD 128620: G2 V), α Cen B (HD 128621: K1 V), and the Sun itself. Data sets include: daily solar ultraviolet irradiance spectra and X-ray fluxes from the Solar Radiation and Climate Experiment, during recent sunspot Cycles 23 and 24; Interface Region

    更新日期:2020-09-05
  • Solar Wind Turbulence from 1 to 45 au. V. Data Intervals from the Voyager Observations
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-09-03
    Zackary B. Pine, Charles W. Smith, Sophia J. Hollick, Matthew R. Argall, Bernard J. Vasquez, Philip A. Isenberg, Nathan A. Schwadron, Colin J. Joyce, Justyna M. Sokół, Maciej Bzowski, Marzena A. Kubiak, and Megan L. McLaurin

    We have surveyed the Voyager 1 and 2 spacecraft magnetic field data from launch in 1977 through 1990 using daily spectrograms to find suitably long data intervals and to eliminate times near transients or strong gradients that might not represent homogeneous turbulence intervals. In the process, we have also omitted times when waves due to suprathermal particle populations such as interstellar pickup

    更新日期:2020-09-05
  • Advanced Composition Explorer Observations of Turbulence from 1998 through 2002: Data Intervals
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-09-03
    Kathleen E. Hamilton, Charles W. Smith, Bernard J. Vasquez, and Robert J. Leamon

    We have published several papers describing solar wind turbulence at 1 au using data from the Advanced Composition Explorer spacecraft. In an oversight that we regret, we never published the list of data intervals that constitute the database of observations. As we have recently returned to this database of observations in comparisons of turbulent observations by the Voyager spacecraft against established

    更新日期:2020-09-05
  • MANTRA: A Machine-learning Reference Light-curve Data Set for Astronomical Transient Event Recognition
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-09-02
    Mauricio Neira, Catalina Gómez, John F. Suárez-Pérez, Diego A. Gómez, Juan Pablo Reyes, Marcela Hernández Hoyos, Pablo Arbeláez, and Jaime E. Forero-Romero

    We introduce Many ANnotated TRAnsients (MANTRA), an annotated data set of 4869 transient and 71207 non-transient object light curves built from the Catalina Real-time Transient Survey. We provide public access to this data set as a plain text file to facilitate standardized quantitative comparison of astronomical transient event recognition algorithms. Some of the classes included in the data set are:

    更新日期:2020-09-03
  • Makemake + Sedna: A Continuum Radiation Transport and Photoionization Framework for Astrophysical Newtonian Fluid Dynamics
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-09-02
    Rolf Kuiper, Harold W. Yorke, and Andrea Mignone

    Astrophysical fluid flow studies often encompass a wide range of physical processes to account for the complexity of the system under consideration. In addition to gravity, a proper treatment of thermodynamic processes via continuum radiation transport and/or photoionization is becoming the state of the art. We present a major update of our continuum radiation transport module, Makemake, and a newly

    更新日期:2020-09-03
  • Artificial Intelligence–Assisted Inversion (AIAI) of Synthetic Type Ia Supernova Spectra
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-09-02
    Xingzhuo Chen, Lei Hu, and Lifan Wang

    We generate ∼100,000 model spectra of Type 1a supernovae (SNe Ia) to form a spectral library for the purpose of building an artificial intelligence–assisted inversion (AIAI) algorithm for theoretical models. As a first attempt, we restrict our studies to the time around B -band maximum and compute theoretical spectra with a broad spectral wavelength coverage from 2000 to 10000 Å using the code TARDIS

    更新日期:2020-09-03
  • The Sloan Digital Sky Survey Reverberation Mapping Project: Photometric g and i Light Curves
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-09-02
    K. Kinemuchi, Patrick B. Hall, Ian McGreer, C. S. Kochanek, Catherine J. Grier, Jonathan Trump, Yue Shen, W. N. Brandt, W. M. Wood-Vasey, Xiaohui Fan, Bradley M. Peterson, Donald P. Schneider, Juan V. Hernández Santisteban, Keith Horne, Yuguang Chen, Sarah Eftekharzadeh, Yucheng Guo, Siyao Jia, Feng Li, Zefeng Li, Jundan Nie, Kara A. Ponder, Jesse Rogerson, Tianmen Zhang, Hu Zou, Linhua Jiang, Luis

    The Sloan Digital Sky Survey (SDSS) Reverberation Mapping program monitors 849 active galactic nuclei (AGNs) both spectroscopically and photometrically. The photometric observations used in this work span over 4 yr and provide an excellent baseline for variability studies of these objects. We present the photometric light curves from 2014 to 2017 obtained by the Steward Observatory’s Bok telescope

    更新日期:2020-09-03
  • The Sloan Digital Sky Survey Quasar Catalog: Sixteenth Data Release
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-08-27
    Brad W. Lyke, Alexandra N. Higley, J. N. McLane, Danielle P. Schurhammer, Adam D. Myers, Ashley J. Ross, Kyle Dawson, Solène Chabanier, Paul Martini, Nicolás G. Busca, Hélion du Mas des Bourboux, Mara Salvato, Alina Streblyanska, Pauline Zarrouk, Etienne Burtin, Scott F. Anderson, Julian Bautista, Dmitry Bizyaev, W. N. Brandt, Jonathan Brinkmann, Joel R. Brownstein, Johan Comparat, Paul Green, Axel

    We present the final Sloan Digital Sky Survey IV (SDSS-IV) quasar catalog from Data Release 16 of the extended Baryon Oscillation Spectroscopic Survey (eBOSS). This catalog comprises the largest selection of spectroscopically confirmed quasars to date. The full catalog includes two subcatalogs (the current versions are DR16Q_v4 andDR16Q_Superset_v3at https://data.sdss.org/sas/dr16/eboss/qso/DR16Q/

    更新日期:2020-08-28
  • Ly α Radiative Transfer: Monte Carlo Simulation of the Wouthuysen–Field Effect
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-08-27
    Kwang-il Seon and Chang-Goo Kim

    A three-dimensional Monte Carlo Ly α radiative transfer (RT) code, named LaRT, is developed to study the Ly α RT and the Wouthuysen–Field (WF) effect. Using the code, we calculate the line profile of Ly α radiation within the multiphase interstellar medium (ISM), with a particular emphasis on gas at low densities. We show that the WF effect is in action: the central portion of the line profile tends

    更新日期:2020-08-28
  • Flight Calibration of the Van Allen Probe Magnetometers
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-08-25
    Bernard J. Vasquez, Charles W. Smith, Kristoff W. Paulson, and C. A. Kletzing

    The twin Van Allen Probes each carry a triaxial fluxgate magnetometer. Their orbits transverse a large of range of magnetic intensity. A procedure is described that calibrates the magnetometer in the spinning-spacecraft frame and in the presence of a persistent gradient of the magnetic field. This is done by extending a model based on a constant background magnetic field to a model with a changing

    更新日期:2020-08-26
  • Completing the 3CR Chandra Snapshot Survey: Extragalactic Radio Sources at High Redshift
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-08-25
    A. Jimenez-Gallardo, F. Massaro, M. A. Prieto, V. Missaglia, C. Stuardi, A. Paggi, F. Ricci, R. P. Kraft, E. Liuzzo, G. R. Tremblay, S. A. Baum, C. P. O’Dea, B. J. Wilkes, J. Kuraszkiewicz, W. R. Forman, and D. E. Harris

    We present the analysis of nine radio sources belonging to the Third Cambridge Revised catalog (3CR) observed with Chandra during Cycle 20 in the redshift range between 1.5 and 2.5. This study completes the 3CR Chandra Snapshot Survey thus guaranteeing the X-ray coverage of all 3CR sources identified to date. This sample lists two compact steep spectrum sources, four radio galaxies, and three quasars

    更新日期:2020-08-26
  • The Variable Mg ii Narrow Absorption Line Systems
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-08-25
    Zhi-Fu Chen, Huan-Chang Qin, Run-Jin Gui, Shuang-Xi Yi, Zhe-Geng Chen, Yan-Chun Gao, Ting-Ting Pang, and Xiao-Hua Mo

    Compared to high ionization C iv absorption lines, variable Mg ii absorption lines are rare. Using spectra from the Sloan Digital Sky Survey, we investigate the variations in Mg ii narrow absorption lines (NALs) for quasars with multi-epoch observations. We have compiled 8958 Mg ii NALs in the spectral regions from the red wings of C iv emission lines to the red wings of Mg ii emission lines. Among

    更新日期:2020-08-26
  • Comprehensive Analysis of the Tidal Effect in Gravitational Waves and Implication for Cosmology
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-08-25
    Bo Wang, Zhenyu Zhu, Ang Li, and Wen Zhao

    Detection of gravitational waves (GWs) produced by coalescence of compact binaries provides a novel way to measure the luminosity distance of GW events. Combining their redshift, they can act as standard sirens to constrain cosmological parameters. For various GW detector networks in second-generation (2G), 2.5G, and 3G, we comprehensively analyze the method to constrain the equation-of-state (EOS)

    更新日期:2020-08-26
  • Identifying and Tracking Solar Magnetic Flux Elements with Deep Learning
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-08-25
    Haodi Jiang, Jiasheng Wang, Chang Liu, Ju Jing, Hao Liu, Jason T. L. Wang, and Haimin Wang

    Deep learning has drawn significant interest in recent years due to its effectiveness in processing big and complex observational data gathered from diverse instruments. Here we propose a new deep learning method, called SolarUnet, to identify and track solar magnetic flux elements or features in observed vector magnetograms based on the Southwest Automatic Magnetic Identification Suite (SWAMIS). Our

    更新日期:2020-08-26
  • A Comprehensive Power Spectral Density Analysis of Astronomical Time Series. I. The Fermi-LAT Gamma-Ray Light Curves of Selected Blazars
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-08-19
    Mariusz Tarnopolski, Natalia Żywucka, Volodymyr Marchenko, and Javier Pascual-Granado

    We present the results of the Fermi-Large Area Telescope 10 yr long light curve (LC) modeling of selected blazars: six flat-spectrum radio quasars (FSRQs) and five BL Lacertae (BL Lacs), examined in 7, 10, and 14 day binning. The LCs and power spectral densities (PSDs) were investigated with various methods: Fourier transform, Lomb–Scargle periodogram (LSP), wavelet scalogram, autoregressive moving

    更新日期:2020-08-20
  • The Quijote Simulations
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-08-19
    Francisco Villaescusa-Navarro, ChangHoon Hahn, Elena Massara, Arka Banerjee, Ana Maria Delgado, Doogesh Kodi Ramanah, Tom Charnock, Elena Giusarma, Yin Li, Erwan Allys, Antoine Brochard, Cora Uhlemann, Chi-Ting Chiang, Siyu He, Alice Pisani, Andrej Obuljen, Yu Feng, Emanuele Castorina, Gabriella Contardo, Christina D. Kreisch, Andrina Nicola, Justin Alsing, Roman Scoccimarro, Licia Verde, Matteo Viel

    The Q uijote simulations are a set of 44,100 full N -body simulations spanning more than 7000 cosmological models in the ##IMG## [http://ej.iop.org/images/0067-0049/250/1/2/apjsab9d82ieqn1.gif] {$\{{{\rm{\Omega }}}_{{\rm{m}}},{{\rm{\Omega }}}_{{\rm{b}}},h,{n}_{s},{\sigma }_{8},{M}_{\nu },w\}$} hyperplane. At a single redshift, the simulations contain more than 8.5 trillion particles over a combined

    更新日期:2020-08-20
  • CMZoom: Survey Overview and First Data Release
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-08-11
    Cara Battersby, Eric Keto, Daniel Walker, Ashley Barnes, Daniel Callanan, Adam Ginsburg, H Perry Hatchfield, Jonathan Henshaw, Jens Kauffmann, J. M. Diederik Kruijssen, Steven N. Longmore, Xing Lu, Elisabeth A. C. Mills, Thushara Pillai, Qizhou Zhang, John Bally, Natalie Butterfield, Yanett A. Contreras, Luis C. Ho, Jürgen Ott, Nimesh Patel, and Volker Tolls

    We present an overview of the CMZoom survey and its first data release. CMZoom is the first blind, high-resolution survey of the Central Molecular Zone (CMZ; the inner 500 pc of the Milky Way) at wavelengths sensitive to the pre-cursors of high-mass stars. CMZoom is a 550 hr Large Program on the Submillimeter Array that mapped at 1.3 mm all of the gas and dust in the CMZ above a molecular hydrogen

    更新日期:2020-08-12
  • Molecular Cloud Cores with a High Deuterium Fraction: Nobeyama Single-pointing Survey
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-08-11
    Gwanjeong Kim, Ken’ichi Tatematsu, Tie Liu, Hee-Weon Yi, Jinhua He, Naomi Hirano, Sheng-Yuan Liu, Minho Choi, Patricio Sanhueza, L. Viktor Tóth, Neal J. Evans II, Siyi Feng, Mika Juvela, Kee-Tae Kim, Charlotte Vastel, Jeong-Eun Lee, Quang Nguyễn Lu’o’ng, Miju Kang, Isabelle Ristorcelli, Orsolya Fehér, Yuefang Wu, Satoshi Ohashi, Ke Wang, Ryo Kandori, Tomoya Hirota, Takeshi Sakai, Xing Lu, Mark A. Thompson

    We present the results of a single-pointing survey of 207 dense cores embedded in Planck Galactic Cold Clumps distributed in five different environments ( λ Orionis, Orion A, Orion B, the Galactic plane, and high latitudes) to identify dense cores on the verge of star formation for the study of the initial conditions of star formation. We observed these cores in eight molecular lines at 76–94 GHz using

    更新日期:2020-08-12
  • The Multi-INstrument Burst ARchive (MINBAR)
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-08-11
    Duncan K. Galloway, Jean in ’t Zand, Jérôme Chenevez, Hauke Wörpel, Laurens Keek, Laura Ootes, Anna L. Watts, Luis Gisler, Celia Sanchez-Fernandez, and Erik Kuulkers

    We present the largest sample of type I (thermonuclear) X-ray bursts yet assembled, comprising 7083 bursts from 85 bursting sources. The sample is drawn from observations with Xenon-filled proportional counters on the long-duration satellites RXTE, BeppoSAX, and International Gamma-Ray Astrophysics Laboratory between 1996 February 8 and 2012 May 3. The burst sources were drawn from a comprehensive

    更新日期:2020-08-12
  • Challenges in Scientific Data Communication from Low-mass Interstellar Probes
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-08-11
    David G. Messerschmitt, Philip Lubin, and Ian Morrison

    An optical downlink for the return of scientific data from space probes at interstellar distances is studied. The context is probes moving at relativistic speed using a terrestrial directed-energy beam for propulsion, necessitating very low mass probes. Achieving simultaneous communication from a swarm of probes launched at regular intervals to a target at the distance of Proxima Centauri is addressed

    更新日期:2020-08-12
  • Classifying Single Stars and Spectroscopic Binaries Using Optical Stellar Templates
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-08-11
    Benjamin R. Roulston, Paul J. Green, and Aurora Y. Kesseli

    Stellar spectral classification is a fundamental tool of modern astronomy, providing insight into physical characteristics such as effective temperature, surface gravity, and metallicity. Accurate and fast spectral typing is an integral need for large all-sky spectroscopic surveys like the Sloan Digital Sky Survey (SDSS) and the Large Sky Area Multi-Object Fiber Spectroscopic Telescope. Here, we present

    更新日期:2020-08-12
  • The R -Process Alliance: Fourth Data Release from the Search for R -process-enhanced Stars in the Galactic Halo
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-08-06
    Erika M. Holmbeck, Terese T. Hansen, Timothy C. Beers, Vinicius M. Placco, Devin D. Whitten, Kaitlin C. Rasmussen, Ian U. Roederer, Rana Ezzeddine, Charli M. Sakari, Anna Frebel, Maria R. Drout, Joshua D. Simon, Ian B. Thompson, Joss Bland-Hawthorn, Brad K. Gibson, Eva K. Grebel, Georges Kordopatis, Andrea Kunder, Jorge Meléndez, Julio F. Navarro, Warren A. Reid, George Seabroke, Matthias Steinmetz

    This compilation is the fourth data release from the R -Process Alliance (RPA) search for r -process-enhanced stars and the second release based on “snapshot” high-resolution ( R ∼ 30,000) spectra collected with the du Pont 2.5 m Telescope. In this data release, we propose a new delineation between the r -I and r -II stellar classes at ##IMG## [http://ej.iop.org/images/0067-0049/249/2/30/apjsab9c19ieqn1

    更新日期:2020-08-10
  • A Catalog of Short Period Spectroscopic and Eclipsing Binaries Identified from the LAMOST and PTF Surveys
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-08-06
    Fan Yang, Richard J. Long, Su-Su Shan, Bo Zhang, Rui Guo, Yu Bai, Zhongrui Bai, Kai-Ming Cui, Song Wang, and Ji-Feng Liu

    Binaries play key roles in determining stellar parameters and exploring stellar evolution models. We build a catalog of 88 eclipsing binaries with spectroscopic information, taking advantage of observations from both the Large Sky Area Multi-Object fiber Spectroscopic Telescope and the Palomar Transient Factory surveys. A software pipeline is constructed to identify binary candidates by examining their

    更新日期:2020-08-10
  • Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. I. Precise Distances, Masses, Ages, and 3D Velocities of ∼140,000 Red Clump Stars
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-08-04
    Yang Huang, Ralph Schönrich, Huawei Zhang, Yaqian Wu, Bingqiu Chen, Haifeng Wang, Maosheng Xiang, Chun Wang, Haibo Yuan, Xinyi Li, Weixiang Sun, Ji Li, and Xiaowei Liu

    We present a sample of ∼140,000 primary red clump (RC) stars of spectral signal-to-noise ratios higher than 20 from the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) Galactic spectroscopic surveys, selected based on their positions in the metallicity-dependent effective temperature–surface gravity and color–metallicity diagrams, supervised by high-quality Kepler asteroseismology

    更新日期:2020-08-06
  • Magnetic Field Dropouts at Near-Sun Switchback Boundaries: A Superposed Epoch Analysis
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-08-04
    W. M. Farrell, R. J. MacDowall, J. R. Gruesbeck, S. D. Bale, and J. C. Kasper

    During Parker Solar Probe’s first close encounter with the Sun in early 2018 November, a large number of impulsive rotations in the magnetic field were detected within 50 R s ; these also occurred in association with short-lived impulsive solar wind bursts in speed. These impulsive features are now called “switchback” events. We examined a set of these switchbacks where the boundary transition into

    更新日期:2020-08-05
  • ECoPANN: A Framework for Estimating Cosmological Parameters Using Artificial Neural Networks
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-08-02
    Guo-Jian Wang, Si-Yao Li, and Jun-Qing Xia

    In this work, we present a new method to estimate cosmological parameters accurately based on the artificial neural network (ANN), and a code called ECoPANN (Estimating Cosmological Parameters with ANN) is developed to achieve parameter inference. We test the ANN method by estimating the basic parameters of the concordance cosmological model using the simulated temperature power spectrum of the cosmic

    更新日期:2020-08-03
  • The Molecular Clouds Associated with the H ii Regions/Candidates between L = 207.°7 and L = 211.°7
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-08-02
    Chong Li, Hongchi Wang, Miaomiao Zhang, Yuehui Ma, and Lianghao Lin

    Using the PMO-13.7 m millimeter telescope at Delingha in China, we have conducted a large-scale simultaneous survey of 12 CO, 13 CO, and C 18 O J = 1 − 0 emission toward the sky region centered at l = 209.°7, b = −2.°25 with a coverage of 4.°0 × 4.°5. The majority of the emission in the region comes from the clouds with velocities lying in the range from −3 to 55 km s −1 , at kinematic distances from

    更新日期:2020-08-03
  • Formation of Complex Organic Molecules in Cold Interstellar Environments through Nondiffusive Grain-surface and Ice-mantle Chemistry
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-08-02
    Mihwa Jin and Robin T. Garrod

    A prevailing theory for the interstellar production of complex organic molecules (COMs) involves formation on warm dust-grain surfaces, via the diffusion and reaction of radicals produced through grain-surface photodissociation of stable molecules. However, some gas-phase O-bearing COMs, notably acetaldehyde (CH 3 CHO), methyl formate (CH 3 OCHO), and dimethyl ether (CH 3 OCH 3 ), are now observed

    更新日期:2020-08-03
  • Forecasting Chemical Abundance Precision for Extragalactic Stellar Archaeology
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-07-28
    Nathan R. Sandford, Daniel R. Weisz, and Yuan-Sen Ting

    Increasingly powerful and multiplexed spectroscopic facilities promise detailed chemical abundance patterns for millions of resolved stars in galaxies beyond the Milky Way (MW). Here, we employ the Cramér–Rao lower bound (CRLB) to forecast the precision to which stellar abundances for metal-poor, low-mass stars outside the MW can be measured for 41 current (e.g., Keck, MMT, the Very Large Telescope

    更新日期:2020-07-29
  • The Galactic Plane Infrared Polarization Survey (GPIPS): Data Release 4
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-07-28
    Dan P. Clemens, L. R. Cashman, C. Cerny, A. M. El-Batal, K. E. Jameson, R. Marchwinski, J. Montgomery, M. Pavel, A. Pinnick, and B. W. Taylor

    The Galactic Plane Infrared Polarization Survey (GPIPS) seeks to characterize the magnetic field in the dusty Galactic disk using near-infrared stellar polarimetry. All GPIPS observations were completed using the 1.83 m Perkins telescope and Mimir instrument. GPIPS observations surveyed 76 deg 2 of the northern Galactic plane, from Galactic longitudes 18°–56° and latitudes −1° to +1°, in the H band

    更新日期:2020-07-29
  • Catalog of Solar Failed Eruptions and Other Dynamic Features Registered by SDO/AIA
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-07-27
    Tomasz Mrozek, Sylwester Kołomański, Marek Stęślicki, and Dominik Gronkiewicz

    In this paper we present our attempt to constrain the first catalog of solar failed eruptions. We used our automatic algorithm that is able to search for dynamic features in the Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA) database. We ran the algorithm on the entire SDO/AIA 171 Å data set. For the time interval from 2010 May 20 to 2019 May 20 we found 12,192 dynamic events.

    更新日期:2020-07-28
  • A Catalog of RV Variable Star Candidates from LAMOST
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-07-27
    Zhijia Tian, Xiaowei Liu, Haibo Yuan, Xuan Fang, Bingqiu Chen, Maosheng Xiang, Yang Huang, Shaolan Bi, Wuming Yang, Yaqian Wu, Chun Wang, Huawei Zhang, Zhiying Huo, Yong Yang, Gaochao Liu, Jincheng Guo, and Meng Zhang

    Radial velocity (RV) variable stars are important in astrophysics. The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) spectroscopic survey has provided ∼6.5 million stellar spectra in its Data Release 4 (DR4). During the survey ∼4.7 million unique sources were targeted and ∼1 million stars observed repeatedly. The probabilities of stars being RV variables are estimated by comparing

    更新日期:2020-07-28
  • The Sejong Suite : Cosmological Hydrodynamical Simulations with Massive Neutrinos, Dark Radiation, and Warm Dark Matter
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-07-23
    Graziano Rossi

    We present the Sejong Suite , an extensive collection of state-of-the-art high-resolution cosmological hydrodynamical simulations spanning a variety of cosmological and astrophysical parameters, primarily developed for modeling the Ly α forest. The suite is organized into three main categories ( Grid Suite , Supporting Suite , and Systematics Suite ), addressing different science targets. Adopting

    更新日期:2020-07-24
  • A Catalog of Solar Flare Events Observed by the SOHO/EIT
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-07-23
    Sumanth A. Rotti, Petrus C. H. Martens, and Berkay Aydin

    We have compiled a catalog of solar flares (SFs) as observed by the Extreme ultraviolet Imaging Telescope (EIT) on board the Solar and Heliospheric Observatory (SOHO) spacecraft and the Geostationary Operational Environmental Satellites (GOES) spacecraft over a span from 1997 to 2010. During mid-1998, the cadence of EIT images was revised from two images per day to 12 minutes . However, the low temporal

    更新日期:2020-07-24
  • The Zwicky Transient Facility Catalog of Periodic Variable Stars
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-07-16
    Xiaodian Chen, Shu Wang, Licai Deng, Richard de Grijs, Ming Yang, and Hao Tian

    The number of known periodic variables has grown rapidly in recent years. Thanks to its large field of view and faint limiting magnitude, the Zwicky Transient Facility (ZTF) offers a unique opportunity to detect variable stars in the northern sky. Here, we exploit ZTF Data Release 2 (DR2) to search for and classify variables down to r ∼ 20.6 mag. We classify 781,602 periodic variables into 11 main

    更新日期:2020-07-17
  • Spectral Properties of Quasars from Sloan Digital Sky Survey Data Release 14: The Catalog
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-07-16
    Suvendu Rakshit, C. S. Stalin, and Jari Kotilainen

    We present measurements of the spectral properties for a total of 526,265 quasars, out of which 63% have a continuum signal-to-noise ratio > 3 pixel −1 , selected from the fourteenth data release of the Sloan Digital Sky Survey (SDSS-DR14) quasar catalog. We performed a careful and homogeneous analysis of the SDSS spectra of these sources to estimate the continuum and line properties of several emission

    更新日期:2020-07-17
  • Parkes Transient Events. I. Database of Single Pulses, Initial Results, and Missing Fast Radio Bursts
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-07-13
    S.-B. Zhang, G. Hobbs, C. J. Russell, L. Toomey, S. Dai, J. Dempsey, R. N. Manchester, S. Johnston, L. Staveley-Smith, X.-F. Wu, D. Li, Y.-Y. Yang, S.-Q. Wang, H. Qiu, R. Luo, C. Wang, C. Zhang, L. Zhang, and R. Mandow

    A large number of observations from the Parkes 64 m diameter radio telescope, recorded with high time resolution, are publicly available. We have reprocessed all of the observations obtained during the first four years (from 1997–2001) of the Parkes Multibeam Receiver system in order to identify transient events, and have built a database that records the 568,736,756 pulse candidates generated during

    更新日期:2020-07-14
  • Electromagnetic Ion Cyclotron Waves Pattern Recognition Based on a Deep Learning Technique: Bag-of-Features Algorithm Applied to Spectrograms
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-07-12
    Claudia Medeiros, V. M. Souza, L. E. A. Vieira, D. G. Sibeck, B. Remya, L. A. Da Silva, L. R. Alves, J. P. Marchezi, P. R. Jauer, M. Rockenbach, A. Dal Lago, and C. A. Kletzing

    Several studies have shown the importance of electromagnetic ion cyclotron (EMIC) waves to the pitch angle scattering of energetic particles in the radiation belt, especially relativistic electrons, thus contributing to their net loss from the outer radiation belt to the upper atmosphere. The huge amount of data collected thus far provides us with the opportunity to use a deep learning technique referred

    更新日期:2020-07-13
  • Identification of Single Spectral Lines through Supervised Machine Learning in a Large HST Survey (WISP): A Pilot Study for Euclid and WFIRST
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-07-12
    I. Baronchelli, C. M. Scarlata, G. Rodighiero, L. Rodríguez-Muñoz, M. Bonato, M. Bagley, A. Henry, M. Rafelski, M. Malkan, J. Colbert, Y. S. Dai, H. Dickinson, C. Mancini, V. Mehta, L. Morselli, and H. I. Teplitz

    Future surveys focusing on understanding the nature of dark energy (e.g., Euclid and WFIRST) will cover large fractions of the extragalactic sky in near-IR slitless spectroscopy. These surveys will detect a large number of galaxies that will have only one emission line in the covered spectral range. In order to maximize the scientific return of these missions, it is imperative that single emission

    更新日期:2020-07-13
  • Microlensing Optical Depth and Event Rate in the OGLE-IV Galactic Plane Fields
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-07-12
    Przemek Mróz, Andrzej Udalski, Michał K. Szymański, Igor Soszyński, Paweł Pietrukowicz, Szymon Kozłowski, Jan Skowron, Radosław Poleski, Krzysztof Ulaczyk, Mariusz Gromadzki, Krzysztof Rybicki, Patryk Iwanek, and Marcin Wrona

    Searches for gravitational microlensing events are traditionally concentrated on the central regions of the Galactic bulge but many microlensing events are expected to occur in the Galactic plane, far from the Galactic Center. Owing to the difficulty in conducting high-cadence observations of the Galactic plane over its vast area, which are necessary for the detection of microlensing events, their

    更新日期:2020-07-13
  • HST/COS Observations of Quasar Outflows in the 500–1050 Å Rest Frame. VII. Distances and Energetics for 11 Outflows in Five Quasars
    Astrophys. J. Suppl. Ser. (IF 7.95) Pub Date : 2020-07-12
    Timothy R. Miller, Nahum Arav, Xinfeng Xu, Gerard A. Kriss, and Rachel J. Plesha

    From Hubble Space Telescope/Cosmic Origins Spectrograph spectra of five quasars, 16 outflows are detected. For 11 outflows, we are able to constrain their distances to the central source ( R ) and their energetics. In instances of multiple electron number density determinations (used in the calculation of R ) for the same outflow, the values are consistent within errors. For the 11 outflows, eight

    更新日期:2020-07-13
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