样式: 排序: IF: - GO 导出 标记为已读
-
Cosmic variance suppression in radiation-hydrodynamic modeling of the reionization-era 21-cm signal Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-15 Anshuman Acharya, Enrico Garaldi, Benedetta Ciardi, Qing-bo Ma
The 21-cm line emitted by neutral hydrogen is the most promising probe of the Epoch of Reionization (EoR). Multiple radio interferometric instruments are on the cusp of detecting its power spectrum. It is therefore essential to deliver robust theoretical predictions, enabling sound inference of the coeval Universe properties. The nature of this signal traditionally required the modelling of $\mathcal
-
The physics of indirect estimators of Lyman Continuum escape and their application to high-redshift JWST galaxies Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-15 Nicholas Choustikov, Harley Katz, Aayush Saxena, Alex J Cameron, Julien Devriendt, Adrianne Slyz, Joki Rosdahl, Jeremy Blaizot, Leo Michel-Dansac
Reliable indirect diagnostics of LyC photon escape from galaxies are required to understand which sources were the dominant contributors to reionization. While multiple LyC escape fraction (fesc) indicators have been proposed to trace favourable conditions for LyC leakage from the interstellar medium of low-redshift “analog” galaxies, it remains unclear whether these are applicable at high redshifts
-
Reinterpreting fundamental plane correlations with machine learning Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-15 Chad Schafer, Sukhdeep Singh, Yesukhei Jagvaral
This work explores the relationships between galaxy sizes and related observable galaxy properties in a large volume cosmological hydrodynamical simulation. The objectives of this work are to develop a better understanding of both the correlations between galaxy properties and the influence of environment on galaxy physics in order to build an improved model for the galaxy sizes, building off of the
-
A dependable distance estimator to black hole low-mass X-ray binaries Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-15 Y Abdulghani, A M Lohfink, J Chauhan
Black Hole Low Mass X-ray Binaries (BH-LMXBs) are excellent observational laboratories for studying many open questions in accretion physics. However, determining the physical properties of BH-LMXBs necessitates knowing their distances. With the increased discovery rate of BH-LMXBs, many canonical methods cannot produce accurate distance estimates at the desired pace. In this study, we develop a versatile
-
Interplay of stellar and gas-phase metallicities: unveiling insights for stellar feedback modeling with illustris, IllustrisTNG, and EAGLE Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-15 Alex M Garcia, Paul Torrey, Kathryn Grasha, Lars Hernquist, Sara Ellison, Henry R M Zovaro, Z S Hemler, Erica J Nelson, Lisa J Kewley
The metal content of galaxies provides a window into their formation in the full context of the cosmic baryon cycle. In this study, we examine the relationship between stellar mass and stellar metallicity (MZ*R) in the hydrodynamic simulations Illustris, TNG, and EAGLE to understand the global properties of stellar metallicities within the feedback paradigm employed by these simulations. Interestingly
-
Heavy ion radiolysis of the chiral terpene α-pinene Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-15 A L F de Barros, A Ricca, A Bychkova, C A P da Costa, J W Costa, P Boduch, H Rothard, E F da Silveira, A Domaracka
Radiolysis of α-pinene by 61.3 MeV 84Kr15 + ions was analyzed with the scope to simulate the effects of heavy ion cosmic ray bombardment on chiral molecules in typical interstellar medium. The α-pinene ice samples were irradiated at 10 K and their chemical evolution was monitored by mid-infrared Fourier transform (FTIR) spectroscopy to characterize the reaction products and to determine the extent
-
Tight stellar binaries favour active longitudes at sub- and anti-stellar points Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-15 Ritika Sethi, David V Martin
Stellar binaries are ubiquitous in the galaxy and a laboratory for astrophysical effects. We use TESS to study photometric modulations in the lightcurves of 162 unequal mass eclipsing binaries from the EBLM (Eclipsing Binary Low Mass) survey, comprising F/G/K primaries and M-dwarf secondaries. We detect modulations on 81 eclipsing binaries. We catalog the rotation rates of the primary star in 69 binaries
-
Triage of the Gaia DR3 astrometric orbits. II. A census of white dwarfs Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-14 S Shahaf, N Hallakoun, T Mazeh, S Ben-Ami, P Rekhi, K El-Badry, S Toonen
The third data release of Gaia was the first to include orbital solutions assuming non-single stars. Here, we apply the astrometric triage technique of Shahaf et al. to identify binary star systems with companions that are not single main-sequence stars. Gaia’s synthetic photometry of these binaries is used to distinguish between systems likely to have white-dwarf companions and those that may be hierarchical
-
Angular correlations of Cosmic Microwave Background spectrum distortions from photon diffusion Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-14 Nathaniel Starkman, Glenn Starkman, Arthur Kosowsky
During cosmic recombination, charged particles bind into neutral atoms and the mean free path of photons rapidly increases, resulting in the familiar diffusion damping of primordial radiation temperature variations. An additional effect is a small photon spectrum distortion, because photons arriving from a particular sky direction were originally in thermal equilibrium at various spatial locations
-
The minimum mass for star formation by dynamical fragmentation: dependence on epoch, dust abundance, and environment Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-14 A P Whitworth, F D Priestley, R Wünsch, J Palouš
We estimate the minimum mass for a star formed by dynamical collapse and fragmentation, as a function of epoch, dust abundance, and environment. Epoch is parametrised by redshift, zred, through the variation in the temperature of the cosmic microwave background. Dust abundance is parametrised by the mass-fraction in dust, ZD, with the additional simplifying assumption that the intrinsic properties
-
Concerning SH0ES data: Discrepant W0, VI Absolute Magnitudes for Cepheids in the keystone galaxy NGC4258 Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-14 Daniel Majaess
SH0ES VI-band photometry for classical Cepheids in the keystone galaxy NGC4258 yield discrepant absolute magnitudes. Specifically, the 2016 and 2022 published SH0ES Cepheid data for NGC4258 exhibit a substantial offset of ΔW0, VI ≃ 0m.3. That adds to a suite of existing concerns associated with the SH0ES analysis, which in sum imply that their relatively non-changing Hubble constant for nearly twenty
-
A new kinematic model of the Galaxy: Analysis of the stellar velocity field from Gaia Data Release 3 Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-14 V S Akhmetov, B Bucciarelli, M Crosta, M G Lattanzi, A Spagna, P Re Fiorentin, E Yu Bannikova
This work presents the results of a kinematic analysis of the Galaxy that uses a new model as applied to the newest available Gaia data. We carry out the Taylor decomposition of the velocity field up to second order for 18 million high luminosity stars (i.e. OBAF-type stars, giants and subgiants) from the Gaia DR3 data. We determine the components of mean stellar velocities and their first and second
-
Effects of grain magnetic properties and grain growth on synthetic dust polarization of MHD simulations in protostellar environments Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-14 Nguyen Chau Giang, Thiem Hoang
Thermal dust polarization is a powerful tool to probe magnetic fields ($\boldsymbol{B}$) and grain properties. However, a systematic study of the dependence of dust polarization on grain properties in protostellar environments is not yet available. In this paper, we post-process a non-ideal MHD simulation of a collapsing protostellar core with our updated POLARIS code to study in detail the effects
-
Machine-learning recovery of foreground wedge-removed 21-cm light cones for high-z galaxy mapping Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-14 Jacob Kennedy, Jonathan Colaço Carr, Samuel Gagnon-Hartman, Adrian Liu, Jordan Mirocha, Yue Cui
Upcoming experiments will map the spatial distribution of the 21-cm signal over three-dimensional volumes of space during the Epoch of Reionization (EoR). Several methods have been proposed to mitigate the issue of astrophysical foreground contamination in tomographic images of the 21-cm signal, one of which involves the excision of a wedge-shaped region in cylindrical Fourier space. While this removes
-
Clumpy Structures within the Turbulent Primordial Cloud Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-14 Ching-Yao Tang, Ke-Jung Chen
The primordial clouds in the mini-halos hatch the first generation stars of the universe, which play a crucial role in cosmic evolution. In this paper, we investigate how turbulence impacts the structure of primordial star-forming clouds. Previous cosmological simulations of the first star formation predicted a typical mass of around 100 M⊙. This conflicts with recent observations of extremely metal-poor
-
The fundamental plane of blazars based on the black hole spin-mass energy Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-14 Xu Zhang, Ding-rong Xiong, Quan-gui Gao, Gui-qin Yang, Fang-wu Lu, Wei-wei Na, Long-hua Qin
We examine the fundamental plane of 91 Blazars which include FSRQs and BL Lacs with known X-ray luminosity (LR), radio luminosity (LX), and black hole mass measurements (M) to reflect the relationship between jet and accretion for blazars. The fundamental plane of Blazars are logLR=${0.273}_{+0.059}^{-0.059}\log L_X$+${0.695}_{+0.191}^{-0.191}\log M$+${25.457}_{+2.728}^{-2.728}$ and logLR=${0.190}_{+0
-
Radio spectra of pulsars fitted with the spectral distribution function of the emission from their current sheet Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-14 Houshang Ardavan
In their catalogue of pulsars’ radio spectra, Swainston et al. distinguish between five different forms of these spectra: those that can be fitted with (i) a simple power law, (ii) a broken power law, (iii) a low-frequency turn-over, (iv) a high-frequency turn-over or (v) a double turn-over spectrum. Here, we choose two examples from each of these categories and fit them with the spectral distribution
-
A statistical analysis of over three thousand meteors and their spectra Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-13 Alberto S Betzler, Takashi Sekiguchi
In this article, over three thousand meteor spectra recorded in Saitama, Japan, between 2018 and 2021 are analyzed. We performed a principal component analysis of the intensity of the sodium and magnesium lines and the iron band of each meteor in combination with the orbital elements and the kinematic parameters such as the geocentric velocity and the initial and final altitudes to determine the relative
-
Unveiling two expanding stellar groups formed through violent relaxation in the lagoon nebula cluster Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-13 Andrea Bonilla-Barroso, Javier Ballesteros-Paredes, Jesús Hernández, Luis Aguilar, Manuel Zamora-Avilés
The current kinematic state of young stellar clusters can give clues on their actual dynamical state and origin. In this contribution, we use Gaia DR3 data of the Lagoon Nebula Cluster (LNC) to show that the cluster is composed of two expanding groups, likely formed from different molecular cloud clumps. We find no evidence of massive stars having larger velocity dispersion than low-mass stars or being
-
21cm Intensity Mapping cross-correlation with galaxy surveys: current and forecasted cosmological parameters estimation for the SKAO Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-13 Maria Berti, Marta Spinelli, Matteo Viel
We present a comprehensive set of forecasts for the cross-correlation signal between 21cm intensity mapping and galaxy redshift surveys. We focus on the data sets that will be provided by the SKAO for the 21cm signal, DESI and Euclid for galaxy clustering. We build a likelihood which takes into account the effect of the beam for the radio observations, the Alcock-Paczynski effect, a simple parameterization
-
Polymer amide as a source of the cosmic 6.2 micron emission and absorption Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-13 Julie E M McGeoch, Malcolm W McGeoch
Cosmic infrared emission and absorption spectra often carry a well-defined and invariant 6.2 micron band that has been proposed to emanate from very small dust grains that may carry polyaromatic hydrocarbons. Hemoglycin, a well-defined polymer of glycine that also contains iron, has been found in meteorites of the primordial CV3 class and therefore originated in the solar protoplanetary disc. Here
-
Amorphous 1-propanol interstellar ice beyond its melting point Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-13 R Ramachandran, A Hazarika, S Gupta, S Nag, J K Meka, Tejender S Thakur, S Yashonath, G Vishwakarma, S-L Chou, Y-J Wu, P Janardhan, B N Rajasekhar, Anil Bhardwaj, N J Mason, B Sivaraman, Prabal K Maiti
The recent discovery of 1-propanol (CH3CH2CH2OH) in the interstellar medium (ISM) is of tremendous interest since fatty alcohols have been proposed as constituents of proto-cell membranes. Motivated by this discovery, we present the laboratory mid-infrared (MIR) and vacuum ultra-violet (VUV) absorption spectra of 1-propanol ice under astrochemical conditions, mimicking an icy mantle on cold dust in
-
The long-lasting effect of X-ray preheating in the post-reionization intergalactic medium Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-13 Paulo Montero-Camacho, Yao Zhang, Yi Mao
X-ray photons can penetrate deep into the intergalactic medium (IGM), leading to preheating of the IGM prior to cosmic reionization. X-ray preheating wipes out some of the small-scale structures that would otherwise be present prior to the passage of an ionization front. Accurate modeling of the small-scale structure is vital to the post-reionization IGM since the small-scale structure is ultimately
-
To test RNLRs − L O3 relation for narrow emission line regions of AGN through low redshift Type-2 AGN in SDSS Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-13 Xue-Guang Zhang
Sizes of narrow emission line regions (NLRs) of AGN could be estimated by [O iii] line luminosity LO3 through the known RNLRs − LO3 empirical relations. Unfortunately, it is not convenient to test the RNLRs − LO3 empirical relations through structure properties of spatially resolved NLRs of large samples of AGN. In this manuscript, a method is proposed to test the $R_{NLRs}-L_{O3}^{\sim 0.25}$ empirical
-
Predicting the linear response of self-gravitating stellar spheres and discs with LinearResponse.jl Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-13 Michael S Petersen, Mathieu Roule, Jean-Baptiste Fouvry, Christophe Pichon, Kerwann Tep
We present LinearResponse.jl, an efficient, versatile public library written in julia to compute the linear response of self-gravitating (3D spherically symmetric) stellar spheres and (2D axisymmetric razor-thin) discs. LinearResponse.jl, can scan the whole complex frequency plane, probing unstable, neutral and (weakly) damped modes. Given a potential model and a distribution function, this numerical
-
VLBI astrometry of radio stars to link radio and optical celestial reference frames: observing strategies Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-13 Jingdong Zhang, Bo Zhang, Shuangjing Xu, Niu Liu, Wen Chen, Hao Ding, Pengfei Jiang, Yan Sun, Jinqing Wang, Lang Cui, Shiming Wen, Xiaofeng Mai, Jinling Li, Fengchun Shu, Yidan Huang
The Gaia celestial reference frame (Gaia-CRF) will benefit from a close assessment with independent methods, such as Very Long Baseline Interferometry (VLBI) measurements of radio stars at bright magnitudes. However, obtaining full astrometric parameters for each radio star through VLBI measurements demands a significant amount of observation time. This study proposes an efficient observing strategy
-
On stellar migration from andromeda to the milky way Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-13 Lukas Gülzow, Malcolm Fairbairn, Dominik J Schwarz
Recent Gaia observations suggest that some hypervelocity stars (HVSs) might originate from outside the Galaxy. We ask if these HVSs could come from as far as Andromeda. Therefore, we simulate HVSs originating in Andromeda with initial conditions based on attributes of high-velocity stars measured in the Milky Way and a simple model for the gravitational potential of Andromeda and the Milky Way. We
-
Astronomical Seeing and Turbulence Profile Simulations over Complex Terrain at the Thai National Observatory Using a Chemistry-Coupled Regional Forecasting Model Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-13 Ronald Macatangay, Somsawatt Rattanasoon, Timothy Butterley, Sherin Hassan Bran, Thiranan Sonkaew, Boonchoo Sukaum, Donrudee Sookjai, Mana Panya, Titaporn Supasri
This study utilized advanced numerical simulations with the Weather Research and Forecasting model coupled with Chemistry (WRF-Chem) to predict anticipated astronomical seeing conditions at the Thai National Observatory (TNO). The study evaluated the effects of both gas-phase and aerosol-phase chemical processes in the Earth's atmosphere, along with the impact of spatial and temporal resolution on
-
The classical T Tauri star CI Tau observed with SPIRou: magnetospheric accretion and planetary formation Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-13 J-F Donati, B Finociety, P I Cristofari, S H P Alencar, C Moutou, X Delfosse, P Fouqué, L Arnold, C Baruteau, Á Kóspál, F Ménard, A Carmona, K Grankin, M Takami, E Artigau, R Doyon, G Hébrard
We report new observations of the classical T Tauri star CI Tau with the SPIRou near-infrared spectropolarimeter and velocimeter at the Canada-France-Hawaii Telescope (CFHT) in late 2019, 2020 and 2022, complemented with observations obtained with the ESPaDOnS optical spectropolarimeter at CFHT in late 2020. From our SPIRou and ESPaDOnS spectra, to which we applied Least-Squares Deconvolution, we infer
-
Towards 21-cm intensity mapping at z = 2.28 with uGMRT using the tapered gridded estimator – IV. Wideband analysis Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-13 Khandakar Md Asif Elahi, Somnath Bharadwaj, Srijita Pal, Abhik Ghosh, Sk Saiyad Ali, Samir Choudhuri, Arnab Chakraborty, Abhirup Datta, Nirupam Roy, Madhurima Choudhury, Prasun Dutta
We present a Wideband Tapered Gridded Estimator (TGE), which incorporates baseline migration and variation of the primary beam pattern for neutral hydrogen ($\rm H\, {\small {I}}$) 21-cm intensity mapping (IM) with large frequency bandwidth radio-interferometric observations. Here we have analysed 394 − 494 MHz (z = 1.9 − 2.6) uGMRT data to estimate the Multi-frequency Angular Power Spectrum (MAPS)
-
The Hertzsprung progression of Classical Cepheids in the Gaia era Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-13 Marcella Marconi, Giulia De Somma, Roberto Molinaro, Anupam Bhardwaj, Vincenzo Ripepi, Ilaria Musella, Teresa Sicignano, Erasmo Trentin, Silvio Leccia
A new fine grid of nonlinear convective pulsation models for the so-called ‘bump Cepheids’ is presented to investigate the Hertzprung progression (HP) phenomenon shown by their light and radial pulsation velocity curves. The period corresponding to the center of the HP is investigated as a function of various model assumptions, such as the efficiency of super-adiabatic convection, the mass-luminosity
-
A novel Bayesian approach for decomposing the radio emission of quasars: I. Modelling the radio excess in red quasars Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-13 B-H Yue, P N Best, K J Duncan, G Calistro-Rivera, L K Morabito, J W Petley, I Prandoni, H J A Röttgering, D J B Smith
Studies show that both radio jets from the active galactic nuclei (AGN) and the star formation (SF) activity in quasar host galaxies contribute to the quasar radio emission; yet their relative contributions across the population remain unclear. Here, we present an improved parametric model that allows us to statistically separate the SF and AGN components in observed quasar radio flux density distributions
-
Using Gaussian Processes to detect AGN flares Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-13 Summer A J McLaughlin, James R Mullaney, Stuart P Littlefair
A key feature of active galactic nuclei (AGN) is their variability across all wavelengths. Typically, AGN vary by a few tenths of a magnitude or more over periods lasting from hours to years. By contrast, extreme variability of AGN – large luminosity changes that are a significant departure from the baseline variability – are known as AGN flares. These events are rare and their timescales poorly constrained
-
Probing nuclear physics with supernova gravitational waves and machine learning Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-13 A Mitra, D Orel, Y S Abylkairov, B Shukirgaliyev, E Abdikamalov
Core-collapse supernovae are sources of powerful gravitational waves (GWs). We assess the possibility of extracting information about the equation of state (EOS) of high density matter from the GW signal. We use the bounce and early post-bounce signals of rapidly rotating supernovae. A large set of GW signals is generated using general relativistic hydrodynamics simulations for various EOS models.
-
Mutual occurrence ratio of planets – I. New clues to reveal origins of hot- and warm-Jupiter from the RV Sample Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-12 Xiang-Ning Su, Hui Zhang, Ji-Lin Zhou
Many studies have analyzed planetary occurrence rates and their dependence on the host’s properties to provide clues to planet formation, but few have focused on the mutual occurrence ratio of different kinds of planets. Such relations reveal whether and how one type of planet evolves into another, e.g. from a cold Jupiter to a warm or even hot Jupiter, and demonstrate how stellar properties impact
-
Homogeneous metallicities for 14 old LMC globular clusters based on their fundamental mode RR Lyrae stars Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-12 Ata Sarajedini
We present the first internally consistent set of [Fe/H] values for 14 of the 15 old globular clusters in the Large Magellanic Cloud (LMC). We make use of periods and amplitudes of fundamental mode (ab-type) RR Lyrae stars in the vicinity of these LMC clusters, mostly taken from the Optical Gravitational Lensing Experiment (OGLE) database, in order to calculate metallicities for the clusters. Our dataset
-
The escape of fast radio burst emission from magnetars Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-12 Maxim Lyutikov
We reconsider the escape of high brightness coherent emission of Fast Radio Bursts (FRBs) from magnetars’ magnetospheres, and conclude that there are numerous ways for the powerful FRB pulse to avoid nonlinear absorption. Sufficiently strong surface magnetic fields, $\ge 10{\%}$ of the quantum field, limit the waves’ non-linearity to moderate values. For weaker fields, the electric field experienced
-
Red supergiant candidates for multimessenger monitoring of the next galactic supernova Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-12 Sarah Healy, Shunsaku Horiuchi, Marta Colomer Molla, Dan Milisavljevic, Jeff Tseng, Faith Bergin, Kathryn Weil, Masaomi Tanaka, Sebastián Otero
We compile a catalog of 578 highly probable and 62 likely red supergiants (RSGs) of the Milky Way, which represents the largest list of Galactic RSG candidates designed for continuous follow-up efforts to date. We match distances measured by Gaia DR3, 2MASS photometry, and a 3D Galactic dust map to obtain luminous bright late-type stars. Determining the stars’ bolometric luminosities and effective
-
Searching for NLTE effects in the high-resolution transmission spectrum of WASP-121 b with Cloudy for Exoplanets Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-12 M E Young, E F Spring, J L Birkby
Ultra-hot Jupiters (UHJs) undergo intense irradiation by their host stars and are expected to experience non-local thermodynamic equilibrium (NLTE) effects in their atmospheres. Such effects are computationally intensive to model but, at the low pressures probed by high-resolution cross-correlation spectroscopy (HRCCS), can significantly impact the formation of spectral lines. The UHJ WASP-121 b exhibits
-
Age of Geminids Derived from the Statistics of Meteoroid Orbits Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-12 D V Milanov, V S Shaidulin, A S Rusakov, A V Veselova
Statistical analysis of samples of the orbits of celestial bodies is complicated by the fact that the Keplerian orbit is a multidimensional object, the coordinate representation of which nonlinearly depends on the choice of orbital elements. In this work, using the construction of the Fréchet mean, concepts of mean orbit and dispersion of the orbit family are introduced, consistent with the distance
-
Cosmic-ray induced ionization rates and non-thermal emissions from nuclei of starburst galaxies Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-12 Vo Hong Minh Phan, Enrico Peretti, Pierre Cristofari, Antoine Gusdorf, Philipp Mertsch
Cosmic rays are the only agent capable of ionizing the interior of dense molecular clouds and, thus, they are believed to play an essential role in determining the physical and chemical evolution of star-forming regions. In this work, we aim to study cosmic-ray induced ionization rates in starburst environments using non-thermal emissions of cosmic rays from starburst nuclei. To this end, we first
-
Unveiling the hidden universe with JWST: The contribution of dust-obscured galaxies to the stellar mass function at z ∼ 3 − 8 Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-12 R Gottumukkala, L Barrufet, P A Oesch, A Weibel, N Allen, B Alcalde Pampliega, E J Nelson, C C Williams, G Brammer, Y Fudamoto, V González, K E Heintz, G Illingworth, D Magee, R P Naidu, M Shuntov, M Stefanon, S Toft, F Valentino, M Xiao
With the advent of JWST, we can probe the rest-frame optical emission of galaxies at z > 3 with high sensitivity and spatial resolution, making it possible to accurately characterise red, optically-faint galaxies and thus move towards a more complete census of the galaxy population at high redshifts. To this end, we present a sample of 148 massive, dusty galaxies from the JWST/CEERS survey, colour-selected
-
Flares during Eclipses of High Mass X-ray Binary Systems Vela X-1, 4U 1700-37, and LMC X-4 Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-12 Ketan Rikame, Biswajit Paul, Rahul Sharma, V Jithes, K T Paul
In eclipsing X-ray binary systems, the direct X-ray emission is blocked by the companion star during the eclipse. We observe only reprocessed emission that contains clues about the environment of the compact object and its chemical composition, ionization levels, etc. We have found flares in some X-ray binaries during their eclipses. The study of eclipse flares provides additional clues regarding the
-
Probing the Physics of Reionization Using kSZ Power Spectrum from Current and Upcoming CMB Surveys Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-12 Divesh Jain, Tirthankar Roy Choudhury, Srinivasan Raghunathan, Suvodip Mukherjee
The patchiness in the reionization process alters the statistics of Cosmic Microwave Background (CMB), with the kinematic Sunyaev-Zel’dovich (kSZ) effect in the CMB temperature power spectrum being a notable consequence. In this work, we aim to explore the potential of future kSZ power spectrum measurements in inferring the details of the reionization process. In this pursuit, we capitalize on the
-
Cliff collapse on Comet 67P/Churyumov–Gerasimenko – II. Imhotep and Hathor Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-12 Björn J R Davidsson
Cliff collapses on Comet 67P/Churyumov–Gerasimenko expose relatively pristine nucleus matter and offer rare opportunities to characterise ice–rich comet material. Here, Microwave Instrument for Rosetta Orbiter (MIRO) observations of two collapsed or crumbling cliffs in the Imhotep and Hathor regions have been assembled. The empirical diurnal antenna temperature curves are analysed with thermophysical
-
Satellite quenching and morphological transformation of galaxies in groups and clusters Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-12 M Oxland, L C Parker, R R de Carvalho, V M Sampaio
We investigate the role that dense environments have on the quenching of star formation and the transformation of morphology for a sample of galaxies selected from the Sloan Digital Sky Survey. We make a distinction between galaxies falling into groups (13 ≤ log (Mhalo/M⊙) < 14) and clusters (log (Mhalo/M⊙) ≥ 14), and compare to a large sample of field galaxies. Using galaxy position in projected phase
-
Observational Properties of AGN Obscuration During the Peak of Accretion Growth Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-12 Bovornpratch Vijarnwannaluk, Masayuki Akiyama, Malte Schramm, Yoshihiro Ueda, Yoshiki Matsuoka, Yoshiki Toba, Naoki Matsumoto, Angel Ruiz, Ioannis Georgantopoulos, Ektoras Pouliasis, Elias Koulouridis, Kohei Ichikawa, Marcin Sawicki, Stephen Gwyn
We investigated the gas obscuration and host galaxy properties of active galactic nuclei (AGN) during the peak of cosmic accretion growth of supermassive black holes (SMBHs) at redshift 0.8-1.8 using X-ray detected AGN with mid-infrared and far-infrared detection. The sample was classified as type-1 and type-2 AGN using optical spectral and morphological classification while the host galaxy properties
-
A new test of gravity - I: Introduction to the method Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-12 Joaquin Armijo, Carlton M Baugh, Peder Norberg, Nelson D Padilla
We introduce a new scheme based on the marked correlation function to probe gravity using the large-scale structure of the Universe. We illustrate our approach by applying it to simulations of the metric-variation f(R) modified gravity theory and general relativity (GR). The modifications to the equations in f(R) gravity lead to changes in the environment of large-scale structures that could, in principle
-
Performance and first measurements of the MAGIC Stellar Intensity Interferometer Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-12 S Abe, J Abhir, V A Acciari, A Aguasca-Cabot, I Agudo, T Aniello, S Ansoldi, L A Antonelli, A Arbet Engels, C Arcaro, M Artero, K Asano, A Babić, A Baquero, U Barres de Almeida, J A Barrio, I Batković, A Bautista, J Baxter, J Becerra González, E Bernardini, M Bernardos, J Bernete, A Berti, J Besenrieder, C Bigongiari, A Biland, O Blanch, G Bonnoli, Ž Bošnjak, I Burelli, G Busetto, A Campoy-Ordaz, A
In recent years, a new generation of optical intensity interferometers has emerged, leveraging the existing infrastructure of Imaging Atmospheric Cherenkov Telescopes (IACTs). The MAGIC telescopes host the MAGIC-SII system (Stellar Intensity Interferometer), implemented to investigate the feasibility and potential of this technique on IACTs. After the first successful measurements in 2019, the system
-
A Dusty Locale: Evolution of galactic dust populations from Milky Way to dwarf-mass galaxies Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-12 Caleb R Choban, Dušan Kereš, Karin M Sandstrom, Philip F Hopkins, Christopher C Hayward, Claude-André Faucher-Giguère
Observations indicate dust populations vary between galaxies and within them, suggesting a complex life cycle and evolutionary history. Here we investigate the evolution of galactic dust populations across cosmic time using a suite of cosmological zoom-in simulations from the Feedback in Realistic Environments (FIRE) project, spanning Mvir = 109 − 12M⊙; M* = 106 − 11 M⊙. Our simulations incorporate
-
Possible GeV gamma-ray emission from the pulsar wind nebula in CTA 1 Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-12 Liancheng Zhou, Keyao Wu, Yunlu Gong, Jun Fang
We report a detection of GeV γ-ray emission potentially originating from the pulsar wind nebula in CTA 1 by analyzing about 15 yr of Fermi Large Area Telescope data. By selecting an energy range from 50 GeV to 1 TeV to remove contamination from the γ-ray pulsar PSR J0007+7303, we have discovered an extended γ-ray source with a TS value of ∼ 44.94 in the region of CTA 1. The obtained flux is measured
-
EDGE – Dark matter or astrophysics? Breaking dark matter heating degeneracies with H i rotation in faint dwarf galaxies Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-12 Martin P Rey, Matthew D A Orkney, Justin I Read, Payel Das, Oscar Agertz, Andrew Pontzen, Anastasia A Ponomareva, Stacy Y Kim, William McClymont
Low-mass dwarf galaxies are expected to reside within dark matter halos that have a pristine, ‘cuspy’ density profile within their stellar half-light radii. This is because they form too few stars to significantly drive dark matter heating through supernova-driven outflows. Here, we study such simulated faint systems (104 ≤ M⋆ ≤ 2 × 106 M⊙) drawn from high-resolution (3 pc) cosmological simulations
-
Measuring the dynamical length of galactic bars Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-11 Michael S Petersen, Martin D Weinberg, Neal Katz
We define a physically-motivated measure for galactic bar length, called the dynamical length. The dynamical length of the bar corresponds to the radial extent of the trapped orbits that are the backbone supporting the bar feature. We propose a direct observational technique well suited to integral field unit spectroscopy to measure it. Identifying these orbits and using the dynamical length is a more
-
Particle initialization effects on Lyman-α forest statistics in cosmological SPH simulations Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-11 Nabendu Kumar Khan, Girish Kulkarni, James S Bolton, Martin G Haehnelt, Vid Iršič, Ewald Puchwein, Shikhar Asthana
Confronting measurements of the Lyman-α forest with cosmological hydrodynamical simulations has produced stringent constraints on models of particle dark matter and the thermal and ionization state of the intergalactic medium. We investigate the robustness of such models of the Lyman-α forest, focussing on the effect of particle initial conditions on the Lyman-α forest statistics in cosmological SPH
-
White Dwarf Pollution; One Star or Two? Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-11 Hiba Tu Noor, Jay Farihi, Mark Hollands, Silvia Toonen
The accretion of tidally disrupted planetary bodies is the current consensus model for the presence of photospheric metals commonly detected in white dwarfs. While most dynamical studies have considered a single star and associated planetary instabilities, several investigations have instead considered the influence of widely-bound stellar companions as potential drivers of white dwarf pollution. This
-
Local models of two-temperature accretion disc coronae – II. Ion thermal conduction and the absence of disc evaporation Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-11 Christopher J Bambic, Eliot Quataert, Matthew W Kunz, Yan-Fei Jiang
We use local stratified shearing-box simulations with magnetic field-aligned thermal conduction to study an idealized model of the coupling between a cold, radiatively efficient accretion disc, and an overlying, hot, two-temperature corona. Evaporation of a cold disc by conduction from the hot corona has been proposed as a means of mediating the soft-to-hard state transitions observed in X-ray binary
-
Long-term double synchronization in close-in gas giant planets Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-11 Shuaishuai Guo, Jianheng Guo, Jie Su, Dongdong Yan
Hot Jupiters, orbiting their host stars at extremely close distances, undergo tidal evolution, with some being engulfed by their stars due to angular momentum exchanges induced by tidal forces. However, achieving double synchronization can prolong their survival. Using the MESA stellar evolution code, combined with the magnetic braking model of Matt et al. (2015), we calculate 25,000 models with different
-
High energy gamma-ray sources in the VVV survey - II. The AGN counterparts Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-11 Laura G Donoso, Ana Pichel, Laura D Baravalle, M Victoria Alonso, Eduardo O Schmidt, Dante Minniti, Nicola Masetti, Leigh C Smith, Philip W Lucas, Carolina Villalon, Adrián C Rovero, Georgina Coldwell
We identified Active Galactic Nuclei (AGN) candidates as counterparts to unidentified gamma-ray sources (UGS) from the Fermi-LAT Fourth Source Catalogue at lower Galactic latitudes. Our methodology is based on the use of near- and mid-infrared photometric data from the VISTA Variables in the Vía Láctea (VVV) and Wide-field Infrared Survey Explorer (WISE) surveys. The AGN candidates associated with
-
Observations of spiral and streamer on a candidate proto-brown dwarf Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-10 B Riaz, D Stamatellos, M N Machida
Spirals and streamers are the hallmarks of mass accretion during the early stages of star formation. We present the first observations of a large-scale spiral and a streamer towards a very young brown dwarf candidate in its early formation stages. These observations show, for the first time, the influence of external environment that results in asymmetric mass accretion via feeding filaments onto a
-
MIGHTEE-H i: H i galaxy properties in the large scale structure environment at z ∼ 0.37 from a stacking experiment Mon. Not. R. Astron. Soc. (IF 4.8) Pub Date : 2024-03-09 Francesco Sinigaglia, Giulia Rodighiero, Ed Elson, Alessandro Bianchetti, Mattia Vaccari, Natasha Maddox, Anastasia A Ponomareva, Bradley S Frank, Matt J Jarvis, Barbara Catinella, Luca Cortese, Sambit Roychowdhury, Maarten Baes, Jordan D Collier, Olivier Ilbert, Ali A Khostovan, Sushma Kurapati, Hengxing Pan, Isabella Prandoni, Sambatriniaina H A Rajohnson, Mara Salvato, Srikrishna Sekhar, Gauri Sharma
We present the first measurement of HI mass of star-forming galaxies in different large scale structure environments from a blind survey at z ∼ 0.37. In particular, we carry out a spectral line stacking analysis considering 2875 spectra of colour-selected star-forming galaxies undetected in HI at 0.23 < z < 0.49 in the COSMOS field, extracted from the MIGHTEE-HI Early Science datacubes, acquired with