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  • Core magnetic field imprint in the nonradial oscillations of red giant stars
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-05
    Pedro Gomes; Ilídio Lopes

    Magnetic fields in red giant stars remain a poorly understood topic, particularly in what concerns their intensity in regions far below the surface. In this work, we propose that gravity-dominated mixed modes of high absolute radial order and low angular degree can be used to probe the magnetic field in their radiative cores. Using two poloidal, axisymmetric configurations for the field in the core

    更新日期:2020-06-05
  • Inverse Compton Signatures of Gamma-Ray Burst Afterglows
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-05
    H Zhang; I M Christie; M Petropoulou; J M Rueda-Becerril; D Giannios

    The afterglow emission from gamma-ray bursts (GRBs) is believed to originate from a relativistic blast wave driven into the circumburst medium. Although the afterglow emission from radio up to X-ray frequencies is thought to originate from synchrotron radiation emitted by relativistic, non-thermal electrons accelerated by the blast wave, the origin of the emission at high energies (HE; ≳ GeV) remains

    更新日期:2020-06-05
  • Prospects for cosmic magnification measurements using HI intensity mapping
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-05
    Amadeus Witzemann; Alkistis Pourtsidou; Mario G Santos

    We investigate the prospects of measuring the cosmic magnification effect by cross-correlating neutral hydrogen intensity mapping (HI IM) maps with background optical galaxies. We forecast the signal-to-noise ratio for HI IM data from SKA1-MID and HIRAX, combined with LSST photometric galaxy samples. We find that, thanks to their different resolutions, SKA1-MID and HIRAX are highly complementary in

    更新日期:2020-06-05
  • Anisotropic separate universe simulations
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-05
    Shogo Masaki; Takahiro Nishimichi; Masahiro Takada

    The long-wavelength coherent overdensity and tidal force, which are not direct observables for a finite-volume survey, affect time evolution of cosmic structure formation and therefore clustering observables through the mode coupling. In this paper we develop an “anisotropic” separate universe (SU) simulation technique to simulate large-scale structure formation taking into account the effect of large-scale

    更新日期:2020-06-05
  • Deep XMM-Newton Observations of the Most Distant SPT-SZ Galaxy Cluster
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-05
    Adam B Mantz; Steven W Allen; R Glenn Morris; Rebecca E A Canning; Matthew Bayliss; Lindsey E Bleem; Benjamin T Floyd; Michael McDonald

    We present results from a 577 ks XMM-Newton observation of SPT-CL J0459−4947, the most distant cluster detected in the South Pole Telescope 2500 square degree (SPT-SZ) survey, and currently the most distant cluster discovered through its Sunyaev-Zel’dovich effect. The data confirm the cluster’s high redshift, z = 1.71 ± 0.02, in agreement with earlier, less precise optical/IR photometric estimates

    更新日期:2020-06-05
  • The Fate of Binary Stars Hosting Planets upon Interaction with Sgr A* Black hole
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-05
    R Capuzzo-Dolcetta; N Davari

    Our Galaxy hosts a very massive object at its centre, often referred to as the supermassive black hole Sgr A*. Its gravitational tidal field is so intense that can strip apart a binary star passing its vicinity and accelerate one of the components of the binary as hypervelocity star (HVS) and grab the other star as S-star. Taken into consideration that many binary star systems are known to host planets

    更新日期:2020-06-05
  • Study of the effects of magnetic braking on the lithium abundances of the Sun and solar-type stars
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-05
    R Caballero Navarro; A García Hernández; A Ayala; J C Suárez

    The study of lithium (Li) surface abundance in the Sun and young stellar globular clusters which are seemingly anomalous in present-day scenarios, as well as the influence of rotation and magnetic braking (MB) on its depletion during pre-main sequence (PMS) and main sequence (MS). In this work, the effects of rotational mixing and of the rotational hydrostatic effects on Li abundances are studied by

    更新日期:2020-06-05
  • New empirical constraints on the cosmological evolution of gas and stars in galaxies
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-05
    Hamsa Padmanabhan; Abraham Loeb

    We combine the latest observationally motivated constraints on stellar properties in dark matter haloes, along with data-driven predictions for the atomic (HI) and molecular (H2) gas evolution in galaxies, to derive empirical relationships between the build-up of galactic components and their evolution over cosmic time. At high redshift (z ≳ 4), the frameworks imply that galaxies acquire their cold

    更新日期:2020-06-05
  • Systematic Opacity Calculations for Kilonovae
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-05
    Masaomi Tanaka; Daiji Kato; Gediminas Gaigalas; Kyohei Kawaguchi

    Coalescence of neutron stars gives rise to kilonova, thermal emission powered by radioactive decays of freshly synthesized r-process nuclei. Although observational properties are largely affected by bound-bound opacities of r-process elements, available atomic data have been limited. In this paper, we study element-to-element variation of the opacities in the ejecta of neutron star mergers by performing

    更新日期:2020-06-05
  • Magnetic fields from Multiplicative Chaos
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-05
    Jean-Baptiste Durrive; Pierre Lesaffre; Katia Ferrière

    An analytical model for fully developed three-dimensional incompressible turbulence was recently proposed in the hydrodynamics community, based on the concept of multiplicative chaos. It consists of a random field represented by means of a stochastic integral, which, with only a few parameters, shares many properties with experimental and numerical turbulence, including in particular energy transfer

    更新日期:2020-06-05
  • Suppression of luminosity and mass–radius relation of highly magnetized white dwarfs
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-05
    Abhay Gupta; Banibrata Mukhopadhyay; Christopher A Tout

    We explore the luminosity L of magnetized white dwarfs and its effect on the mass–radius relation. We self-consistently obtain the interface between the electron degenerate gas dominated inner core and the outer ideal gas surface layer or envelope by incorporating both the components of gas throughout the model white dwarf. This is obtained by solving the set of magnetostatic equilibrium, photon diffusion

    更新日期:2020-06-05
  • The C-Band All-Sky Survey (C-BASS): Total intensity point-source detection over the northern sky
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-05
    R D P Grumitt; Angela C Taylor; Luke Jew; Michael E Jones; C Dickinson; A Barr; R Cepeda-Arroita; H C Chiang; S E Harper; H M Heilgendorff; J L Jonas; J P Leahy; J Leech; T J Pearson; M W Peel; A C S Readhead; J Sievers

    We present a point-source detection algorithm that employs the second order Spherical Mexican Hat wavelet filter (SMHW2), and use it on C-BASS northern intensity data to produce a catalogue of point-sources. This catalogue allows us to cross-check the C-BASS flux-density scale against existing source surveys, and provides the basis for a source mask which will be used in subsequent C-BASS and cosmic

    更新日期:2020-06-05
  • Effects of the Hubble Parameter on the Cosmic Growth of the First Quasars
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-05
    Rafael C Nunes; Fabio Pacucci

    Supermassive black holes (SMBHs) play a crucial role in the evolution of galaxies and are currently detected up to z ∼ 7.5. Theories describing black hole (BH) growth are challenged by how rapidly seeds with initial mass M• ≲ 105 M⊙, formed at z ∼ 20 − 30, grew to M• ∼ 109 M⊙ by z ∼ 7. Here we study the effects of the value of the Hubble parameter, H0, on models describing the early growth of BHs.

    更新日期:2020-06-05
  • Spectroscopic and Photometric Periods of Six Ultracompact Accreting Binaries
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-05
    Matthew J Green; Thomas R Marsh; Philip J Carter; Danny Steeghs; Elmé Breedt; V S Dhillon; S P Littlefair; Steven G Parsons; Paul Kerry; Nicola P Gentile Fusillo; R P Ashley; Madelon C P Bours; Tim Cunningham; Martin J Dyer; Boris T Gänsicke; Paula Izquierdo; Anna F Pala; Chuangwit Pattama; Sabrina Outmani; David I Sahman; Boonchoo Sukaum; James Wild

    Ultracompact accreting binary systems each consist of a stellar remnant accreting helium-enriched material from a compact donor star. Such binaries include two related sub-classes, AM CVn-type binaries and helium cataclysmic variables, in both of which the central star is a white dwarf. We present a spectroscopic and photometric study of six accreting binaries with orbital periods in the range of 40–70 min

    更新日期:2020-06-05
  • A Mechanism of Spark Motion in Inner Acceleration Region to Investigate Subpulse Drifting in Pulsars
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-05
    Rahul Basu; Dipanjan Mitra; George I Melikidze

    Coherent radio emission in pulsars is excited due to instabilities in a relativistically streaming non-stationary plasma flow, which is generated from sparking discharges in the inner acceleration region (IAR) near the stellar surface. A number of detailed works have shown the IAR to be a partially screened gap (PSG) dominated by non-dipolar magnetic fields with continuous outflow of ions from the

    更新日期:2020-06-05
  • Ionic emissions in comet C/2016 R2 (Pan-STARRS)
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-05
    Kumar Venkataramani; Shashikiran Ganesh; Kiran S Baliyan

    We have carried out observations of a peculiar comet, C/2016 R2 (Pan-STARRS), using a low-resolution spectrograph mounted on the 1.2-m telescope at Mount Abu Infrared Observatory, India. The comet was observed on two dates in 2018 January, when it was at a heliocentric distance of 2.8 au. A study based on our observations has revealed that the optical spectrum of this comet is quite unusual compared

    更新日期:2020-06-05
  • Erratum: A physically motivated definition for the size of galaxies in an era of ultra-deep imaging
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-05
    Ignacio Trujillo; Nushkia Chamba; Johan H Knapen

    errata, addendamethods: data analysismethods: observationaltechniques: photometricgalaxies: formationgalaxies: fundamental parametersgalaxies: photometry

    更新日期:2020-06-05
  • The X-ray emission in young radio AGNs
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-04
    Mai Liao; Minfeng Gu; Minhua Zhou; Liang Chen

    In this work, we investigated the X-ray emission for a sample of young radio AGNs by combining their data from Chandra/XMM-Newton and at other wavebands. We find strong correlations between the X-ray luminosity LX in 2−10 keV and the radio luminosities LR at 5 GHz for VLBI radio-core, VLA radio-core and FIRST component, indicating that both pc- and kpc-scale radio emission strongly correlate with X-ray

    更新日期:2020-06-04
  • Wavefront prediction using artificial neural networks for open-loop Adaptive Optics
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-04
    Xuewen Liu; Tim Morris; Chris Saunter; Francisco Javier de Cos Juez; Carlos González-Gutiérrez; Lisa Bardou

    Latency in the control loop of adaptive optics (AO) systems can severely limit performance. Under the frozen flow hypothesis linear predictive control techniques can overcome this, however identification and tracking of relevant turbulent parameters (such as wind speeds) is required for such parametric techniques. This can complicate practical implementations and introduce stability issues when encountering

    更新日期:2020-06-04
  • Uncovering the Orbit of the Hercules Dwarf Galaxy
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-04
    Alexandra L Gregory; Michelle L M Collins; Denis Erkal; Erik Tollerud; Maxime Delorme; Lewis Hill; David J Sand; Jay Strader Beth Willman

    We present new chemo–kinematics of the Hercules dwarf galaxy based on Keck II– DEIMOS spectroscopy. Our 21 confirmed members, including 9 newly confirmed members, have a systemic velocity of vHerc = 46.4 ± 1.3 kms−1 and a velocity dispersion |$\sigma _{v,\mathrm{Herc}}=4.4^{+1.4}_{-1.2}$| kms−1, consistent with previous studies. From the strength of the Ca II triplet, we obtain a metallicity of [Fe/H]=

    更新日期:2020-06-04
  • The initial evolution of millisecond magnetars: an analytical solution
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-04
    S Çıkıntoğlu; S Şaşmaz Muş; K Yavuz Ekşi

    Millisecond magnetars are often invoked as the central engine of some gamma-ray bursts (GRBs), specifically the ones showing a plateau phase. We argue that an apparent plateau phase may not be realized if the magnetic field of the nascent magnetar is in a transient rapid decay stage. Some GRBs that lack a clear plateau phase may also be hosting millisecond magnetars. We present an approximate analytical

    更新日期:2020-06-04
  • The role of dust destruction and dust growth in the evolution of the interstellar medium
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-04
    Omima Osman; Kenji Bekki; Luca Cortese

    We use Milky Way–like chemodynamical simulations with a new treatment for dust destruction and growth to investigate how these two processes affect the properties of the interstellar medium in galaxies. We focus on the role of two specific parameters: fdes (a new parameter that determines the fraction of dust destroyed in a single gas particle surrounding supernova) and Cs (the probability that a metal

    更新日期:2020-06-04
  • TESS photometry of helium-rich hot subdwarfs: r modes in BD+37○442 and BD+37○1977
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-04
    C Simon Jeffery

    TESS photometry of the extremely helium-rich hot subdwarfs BD+37○442 and BD+37○1977 demonstrates multi-periodic low-amplitude variability with principal periods of 0.56 and 1.14 d, respectively, and with both first and second harmonics present. The lightcurves are not perfectly regular, implying additional periodic and/or non-periodic content. Possible causes are examined, including the binary hypothesis

    更新日期:2020-06-04
  • Timing the earliest quenching events with a robust sample of massive quiescent galaxies at 2 < z < 5
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-04
    A C Carnall; S Walker; R J McLure; J S Dunlop; D J McLeod; F Cullen; V Wild; R Amorin; M Bolzonella; M Castellano; A Cimatti; O Cucciati; A Fontana; A Gargiulo; B Garilli; M J Jarvis; L Pentericci; L Pozzetti; G Zamorani; A Calabro; N P Hathi; A M Koekemoer

    We present a sample of 151 massive (M* > 1010M⊙) quiescent galaxies at 2 < z < 5, based on a sophisticated Bayesian spectral energy distribution fitting analysis of the CANDELS UDS and GOODS-South fields. Our sample includes a robust sub-sample of 61 objects for which we confidently exclude low-redshift and star-forming solutions. We identify 10 robust objects at z > 3, of which 2 are at z > 4. We

    更新日期:2020-06-04
  • The early growth of supermassive black holes in cosmological hydrodynamic simulations with constrained Gaussian realizations
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-04
    Kuan-Wei Huang; Yueying Ni; Yu Feng; Tiziana Di Matteo

    The paper examines the early growth of supermassive black holes (SMBHs) in cosmological hydrodynamic simulations with different BH seeding scenarios. Employing the constrained Gaussian realization, we reconstruct the initial conditions in the large-volume BlueTides simulation and run them to z = 6 to cross-validate that the method reproduces the first quasars and their environments. Our constrained

    更新日期:2020-06-04
  • The ALPINE−ALMA [CII] Survey: On the nature of an extremely obscured serendipitous galaxy
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-04
    M Romano; P Cassata; L Morselli; B C Lemaux; M Béthermin; P Capak; A Faisst; O Le Fèvre; D Schaerer; J Silverman; L Yan; S Bardelli; M Boquien; A Cimatti; M Dessauges-Zavadsky; A Enia; Y Fudamoto; S Fujimoto; M Ginolfi; C Gruppioni; N P Hathi; E Ibar; G C Jones; A M Koekemoer; F Loiacono; C Mancini; D A Riechers; G Rodighiero; L Rodríguez-Muñoz; M Talia; L Vallini; D Vergani; G Zamorani; E Zucca

    We report the serendipitous discovery of a dust-obscured galaxy observed as part of the ALMA Large Program to INvestigate [CII] at Early times (ALPINE). While this galaxy is detected both in line and continuum emissions in ALMA Band 7, it is completely dark in the observed optical/near-infrared bands and only shows a significant detection in the UltraVISTA Ks band. We discuss the nature of the observed

    更新日期:2020-06-04
  • On the role of reduced wind mass-loss rate in enabling exoplanets to shape planetary nebulae
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-04
    Ahlam Hegazi; Ealeal Bear; Noam Soker

    We use the stellar evolution code MESA-binary and follow the evolution of three exoplanets and two brown dwarfs (BDs) to determine their potential role in the future evolution of their parent star on the red giant branch (RGB) and on the asymptotic giant branch (AGB). We limit this study to exoplanets and BDs with orbits that have semi-major axis of |$1 {~\rm AU}\lesssim a_0 \lesssim 20 {~\rm AU}$|⁠

    更新日期:2020-06-04
  • Uncovering distinct environments in an extended physical system around the W33 complex
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-04
    L K Dewangan; T Baug; D K Ojha

    We present a multi-wavelength investigation of a large-scale physical system containing the W33 complex. The extended system (∼50 pc × 37 pc) is selected based on the distribution of molecular gas at [29.6, 60.2] km s−1 and of 88 ATLASGAL 870 μm dust clumps at d ∼2.6 kpc. The extended system/molecular cloud traced in the maps of 13CO and C18O emission contains several H ii regions excited by OB stars

    更新日期:2020-06-04
  • A Framework for Measuring Weak-Lensing Magnification Using the Fundamental Plane
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-04
    Jenna K C Freudenburg; Eric M Huff; Christopher M Hirata

    Galaxy-galaxy lensing is an essential tool for probing dark matter halos and constraining cosmological parameters. While galaxy-galaxy lensing measurements usually rely on shear, weak-lensing magnification contains additional constraining information. Using the fundamental plane (FP) of elliptical galaxies to anchor the size distribution of a background population is one method that has been proposed

    更新日期:2020-06-04
  • The post-maximum behaviour of the changing-look Seyfert galaxy NGC 1566
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-04
    V L Oknyansky; H Winkler; S S Tsygankov; V M Lipunov; E S Gorbovskoy; F van Wyk; D A H Buckley; B W Jiang; N V Tyurina

    We present results of the long-term multi-wavelength study of optical, UV and X-ray variability of the nearby changing-look (CL) Seyfert NGC 1566 observed with the Swift Observatory and the MASTER Global Robotic Network from 2007 to 2019. We started spectral observations with South African Astronomical Observatory 1.9-m telescope soon after the brightening was discovered in July 2018 and present here

    更新日期:2020-06-04
  • Three generations of stars: a possible case of triggered star formation
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-04
    M B Areal; A Buccino; S Paron; C Fariña; M E Ortega

    Evidence for triggered star formation linking three generations of stars is difficult to assemble, as it requires convincingly associating evolved massive stars with H ii regions that, in turn, would need to present signs of active star formation. We present observational evidence for triggered star formation relating three generations of stars in the neighbourhood of the star LS II +26 8. We carried

    更新日期:2020-06-04
  • The nuclear architecture of NGC 4151: on the trace of a global outflow mechanism in light of NGC 1068
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-04
    D May; J E Steiner; R B Menezes; D R A Williams; J Wang

    We report near-infrared (NIR) IFU observations of the active galactic nucleus NGC 4151 with archive data from the NIFS-Gemini North Telescope. We have selected best-seeing observations (≲0.3 arcsec) that, allied to our methodology of image processing techniques, show structures with spatial resolution comparable to those of the HST. The intricate outflow of NGC 4151 is revisited in light of the results

    更新日期:2020-06-04
  • The radio-loud narrow-line Seyfert 1 galaxy 1H 0323+342 in a galaxy merger
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-04
    Akihiro Doi; Motoki Kino; Nozomu Kawakatu; Kazuhiro Hada

    The supermassive black holes (SMBHs) of narrow-line Seyfert 1 galaxies (NLS1s) are at the lowest end of mass function of active galactic nuclei (AGNs) and preferentially reside in late-type host galaxies with pseudobulges, which are thought to be formed by internal secular evolution. On the other hand, the population of radio-loud NLS1s presents a challenge for the relativistic jet paradigm that powerful

    更新日期:2020-06-04
  • Passive spirals and shock influenced star formation in the merging cluster A3376
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-03
    Kshitija Kelkar; K S Dwarakanath; Bianca M Poggianti; Alessia Moretti; Rogério Monteiro-Oliveira; Rubens E G Machado; Gastão B Lima-Neto; Jacopo Fritz; Benedetta Vulcani; Marco Gullieuszik; Daniela Bettoni

    We present a detailed analysis of star formation properties of galaxies in a nearby (z ∼ 0.046) young (∼0.6 Gyr) post-merger cluster system A3376, with a moderate merger shock front (vs ∼1630 km s−1; |$\mathcal {M}$| ∼ 2) observed as symmetric radio relics. Exploiting the spectroscopic data from the wide-field OmegaWINGS survey and the associated photometric information, our investigations reveal the

    更新日期:2020-06-03
  • Hydrodynamical turbulence in eccentric circumbinary discs and its impact on the in situ formation of circumbinary planets
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-03
    Arnaud Pierens; Colin P McNally; Richard P Nelson

    Eccentric gaseous discs are unstable to a parametric instability involving the resonant interaction between inertial-gravity waves and the eccentric mode in the disc. We present 3D global hydrodynamical simulations of inviscid circumbinary discs that form an inner cavity and become eccentric through interaction with the central binary. The parametric instability grows and generates turbulence that

    更新日期:2020-06-03
  • The interpretation of protoplanetary disc wind diagnostic lines from X-ray photoevaporation and analytical MHD models
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-03
    Michael L Weber; Barbara Ercolano; Giovanni Picogna; Lee Hartmann; Peter J Rodenkirch

    High resolution spectra of typical wind diagnostics ([OI] 6300 Å and other forbidden emission lines) can often be decomposed into multiple components: high-velocity components with blueshifts up to several 100 km/s are usually attributed to fast jets, while narrow (NLVC) and broad (BLVC) low-velocity components are believed to trace slower disc winds. Under the assumption that the line-broadening is

    更新日期:2020-06-03
  • Inertial oscillation modes of an inclined dipolar magnetosphere as a source of band-limited noise in X-ray pulsars
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-03
    Pavel Abolmasov; Anton Biryukov

    Magnetic fields of strongly magnetized stars can trap conducting matter due to frozen-in condition. In the force-free regime, the motion of the matter along the field lines may be considered in the “bead on a wire” approximation. Such a motion, if gravity and centrifugal forces are taken into account, has equilibrium points, some of which are stable. In most cases, stability is possible in about several

    更新日期:2020-06-03
  • High Redshift Long Gamma-Ray Bursts Hubble Diagram as a Test of Basic Cosmological Relations
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-03
    S I Shirokov; I V Sokolov; N Yu Lovyagin; L Amati; Yu V Baryshev; V V Sokolov; V L Gorokhov

    We examine the prospects of the high redshift Long Gamma Ray Bursts (LGRB) Hubble Diagram as a test of the basic cosmological principles. Analysis of the Hubble Diagram allows us to test several fundamental cosmological principles using the directly observed flux-distance-redshift relation. Modern LGRB data, together with the correlation between the spectral peak energy and the isotropic-equivalent

    更新日期:2020-06-03
  • Planetary nebulae with Wolf-Rayet-type central stars - I. The case of the high-excitation NGC 2371
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-03
    V M A Gómez-González; J A Toalá; M A Guerrero; H Todt; L Sabin; G Ramos-Larios; Y D Mayya

    We present the analysis of the planetary nebula (PN) NGC 2371 around the [Wolf-Rayet] ([WR]) star WD 0722+295. Our Isaac Newton Telescope (INT) Intermediate Dispersion Spectrograph (IDS) spectra, in conjunction with archival optical and UV images, unveil in unprecedented detail the high-ionisation of NGC 2371. The nebula has an apparent multipolar morphology, with two pairs of lobes protruding from

    更新日期:2020-06-03
  • Testing the Reliability of Fast Methods for Weak Lensing Simulations: wl-moka on pinocchio
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-03
    Carlo Giocoli; Pierluigi Monaco; Lauro Moscardini; Tiago Castro; Massimo Meneghetti; R Benton Metcalf; Marco Baldi

    The generation of simulated convergence maps is of key importance in fully exploiting weak lensing by Large Scale Structure (LSS) from which cosmological parameters can be derived. In this paper we present an extension of the pinocchio code which produces catalogues of dark matter haloes so that it is capable of simulating weak lensing by LSS. Like wl-moka, the method starts with a random realisation

    更新日期:2020-06-03
  • What determines the maximum stellar surface density of galaxies?
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-03
    Chih-Teng Ling; Tetsuya Hashimoto; Tomotsugu Goto; Ting-Yi Lu; Alvina Y L On; Daryl Joe D Santos; Tiger Y-Y Hsiao; Simon C-C Ho

    Observationally, it has been reported that the densest stellar system in the Universe does not exceed a maximum stellar surface density, |$\Sigma ^{\max }_{*}$| = 3 × 105M⊙pc−2, throughout a wide physical scale ranging from star cluster to galaxy. This suggests there exists a fundamental physics which regulates the star formation and stellar density. However, factors that determine this maximum limit

    更新日期:2020-06-03
  • A Method for Discriminating Between Dark Matter Models and MOND Modified Inertia via Galactic Rotation Curves
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-03
    Jonas Petersen; Mads T Frandsen

    Dark Matter (DM) and Modified Newtonian Dynamics (MOND) models of rotationally supported galaxies lead to curves with different geometries in (gN, gtot)-space (g2-space). Here gtot is the total acceleration and gN is the acceleration as obtained from the baryonic matter via Newtonian dynamics. In MOND modified inertia (MI) models the curves in g2-space are closed with zero area and so curve segments

    更新日期:2020-06-03
  • The polarized spectral energy distribution of NGC 4151
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-03
    F Marin; J Le Cam; E Lopez-Rodriguez; M Kolehmainen; B L Babler; M R Meade

    NGC 4151 is among the most well-studied Seyfert galaxies that does not suffer from strong obscuration along the observer’s line-of-sight. This allows to probe the central active galactic nucleus (AGN) engine with photometry, spectroscopy, reverberation mapping or interferometry. Yet, the broadband polarization from NGC 4151 has been poorly examined in the past despite the fact that polarimetry gives

    更新日期:2020-06-03
  • Constraining X-ray emission in HBL blazars using multiwavelength observations
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-03
    Alicja Wierzcholska; Stefan J Wagner

    The X-ray spectrum of extreme HBL type blazars is located in the synchrotron branch of the broadband spectral energy distribution (SED), at energies below the peak. A joint fit of the extrapolated X-ray spectra together with a host galaxy template allows characterizing the synchrotron branch in the SED. The X-ray spectrum is usually characterized either with a pure or a curved power-law model. In the

    更新日期:2020-06-03
  • Linking the small scale relativistic winds and the large scale molecular outflows in the z = 1.51 lensed quasar HS 0810+2554
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-03
    G Chartas; E Davidson; M Brusa; C Vignali; M Cappi; M Dadina; G Cresci; R Paladino; G Lanzuisi; A Comastri

    We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of the quadruply lensed z = 1.51 quasar HS 0810+2554 which provide useful insight on the kinematics and morphology of the CO molecular gas and the ∼ 2 mm continuum emission in the quasar host galaxy. Lens modeling of the mm-continuum and the spectrally integrated CO(J=3→2) images indicates that the source of the mm-continuum

    更新日期:2020-06-03
  • Progenitors of early-time interacting supernovae
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-03
    Ioana Boian; Jose H Groh

    We compute an extensive set of early-time spectra of supernovae interacting with circumstellar material using the radiative transfer code CMFGEN. Our models are applicable to events observed from 1 to a few days after explosion. Using these models, we constrain the progenitor and explosion properties of a sample of 17 observed interacting supernovae at early-times. Because massive stars have strong

    更新日期:2020-06-03
  • Galaxy And Mass Assembly (GAMA): Assimilation of KiDS into the GAMA database
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-03
    Sabine Bellstedt; Simon P Driver; Aaron S G Robotham; Luke J M Davies; Cameron R J Bogue; Robin H W Cook; Abdolhosein Hashemizadeh; Soheil Koushan; Edward N Taylor; Jessica E Thorne; Ryan J Turner; Angus H Wright

    The Galaxy And Mass Assembly Survey (GAMA) covers five fields with highly complete spectroscopic coverage (>95 per cent) to intermediate depths (r < 19.8 or i < 19.0 mag), and collectively spans 250 square degrees of Equatorial or Southern sky. Four of the GAMA fields (G09, G12, G15 and G23) reside in the ESO VST KiDS and ESO VISTA VIKING survey footprints, which combined with our GALEX, WISE and Herschel

    更新日期:2020-06-03
  • Structure of the self-gravitating accretion disks in the presence of outflow
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-03
    Hanifeh Ghanbarnejad; Maryam Ghasemnezhad

    Numerical simulations of self-gravitating accretion disks have shown that the evolution of such systems depends strongly on the rate at which it cools. In this work we study the vertical structure of the self-gravitating accretion disks and also investigate the effect of the cooling rate on the latitudinal structure of such accretion disks. In the spherical coordinates, we write the hydrodynamics equations

    更新日期:2020-06-03
  • Primordial magnetic fields during the cosmic dawn in light of EDGES 21-cm signal
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-03
    Ankita Bera; Kanan K Datta; Saumyadip Samui

    We study prospects of constraining the primordial magnetic field (PMF) and its evolution during the dark ages and cosmic dawn in light of EDGES 21-cm signal. Our analysis has been carried out on a ‘colder IGM’ background which is one of the promising avenues to interpret the EDGES signal. We consider the dark matter-baryon interactions for the excess cooling. We find that the colder IGM suppresses

    更新日期:2020-06-03
  • The SDSS/APOGEE Catalog of HgMn Stars
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-03
    S Drew Chojnowski; Swetlana Hubrig; Sten Hasselquist; Rachael L Beaton; Steven R Majewski; D A García-Hernández; David DeColibus

    We report on H-band spectra of chemically peculiar Mercury-Manganese (HgMn) stars obtained via the SDSS/APOGEE survey. As opposed to other varieties of chemically peculiar stars such as classical Ap/Bp stars, HgMn stars lack strong magnetic fields and are defined by extreme overabundances of Mn, Hg, and other heavy elements. A satisfactory explanation for the abundance patterns remains to be determined

    更新日期:2020-06-03
  • The Flare Cumulative Frequencies of UV Ceti Stars From Different Spectral Types
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-03
    H A Dal

    In this study, as a result of the photometric observations continued on nine UV Ceti type stars, examining the parameters obtained from the models of distributions of the flare equivalent durations in the logarithmic scale versus flare total durations, it is found that the highest flare equivalent durations occurring on the stars (Plateau values) are varying with the B − V colour indexes of those stars

    更新日期:2020-06-03
  • Testing the cosmic curvature at high redshifts: the combination of LSST strong lensing systems and quasars as new standard candles
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-03
    Tonghua Liu; Shuo Cao; Jia Zhang; Marek Biesiada; Yuting Liu; Yujie Lian

    The cosmic curvature, a fundamental parameter for cosmology could hold deep clues to inflation and cosmic origins. We propose an improved model-independent method to constrain the cosmic curvature by combining the constructed Hubble diagram of high-redshift quasars with galactic-scale strong lensing systems expected to be seen by the forthcoming LSST survey. More specifically, the most recent quasar

    更新日期:2020-06-03
  • General Relativistic Hydrodynamics on a Moving-mesh I: Static Spacetimes
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-03
    Philip Chang; Zachariah B Etienne

    We present the moving-mesh general relativistic hydrodynamics solver for static spacetimes as implemented in the code, MANGA. Our implementation builds on the architectures of MANGA and the numerical relativity Python package NRPy+. We review the general algorithm to solve these equations and, in particular, detail the time stepping; Riemann solution across moving faces; conversion between primitive

    更新日期:2020-06-03
  • The globular cluster system of the Auriga simulations
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-03
    Timo L R Halbesma; Robert J J Grand; Facundo A Gómez; Federico Marinacci; Rüdiger Pakmor; Wilma H Trick; Philipp Busch; Simon D M White

    We investigate whether the galaxy and star formation model used for the Auriga simulations can produce a realistic globular cluster (GC) population. We compare statistics of GC candidate star particles in the Auriga haloes with catalogues of the Milky Way (MW) and Andromeda (M31) GC populations. We find that the Auriga simulations do produce sufficient stellar mass for GC candidates at radii and metallicities

    更新日期:2020-06-03
  • K2-HERMES II. Planet-candidate properties from K2 Campaigns 1-13
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-03
    Robert A Wittenmyer; Jake T Clark; Sanjib Sharma; Dennis Stello; Jonathan Horner; Stephen R Kane; Catherine P Stevens; Duncan J Wright; Lorenzo Spina; Klemen Čotar; Martin Asplund; Joss Bland-Hawthorn; Sven Buder; Andrew R Casey; Gayandhi M De Silva; Valentina D’Orazi; Ken Freeman; Janez Kos; Geraint Lewis; Jane Lin; Karin Lind; Sarah L Martell; Jeffrey D Simpson; Daniel B Zucker; Tomaz Zwitter

    Accurate and precise radius estimates of transiting exoplanets are critical for understanding their compositions and formation mechanisms. To know the planet, we must know the host star in as much detail as possible. We present complete results for planet-candidate hosts from the K2-HERMES survey, which uses the HERMES multi-object spectrograph on the Anglo-Australian Telescope to obtain R∼28,000 spectra

    更新日期:2020-06-03
  • Is Fornax 4 the nuclear star cluster of the Fornax dwarf spheroidal galaxy?
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-03
    S Martocchia; E Dalessandro; M Salaris; S Larsen; M Rejkuba

    Fornax 4 is the most distinctive globular cluster in the Fornax dwarf spheroidal. Located close to the centre of the galaxy, more metal-rich and potentially younger than its four companions (namely, Fornax clusters number 1, 2, 3 and 5), it has been suggested to have experienced a different formation than the other clusters in the galaxy. Here we use HST/WFC3 photometry to characterize the stellar

    更新日期:2020-06-03
  • Emulating the Global 21-cm Signal from Cosmic Dawn and Reionization
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-03
    Aviad Cohen; Anastasia Fialkov; Rennan Barkana; Raul A Monsalve

    The 21-cm signal of neutral hydrogen is a sensitive probe of the Epoch of Reionization (EoR), Cosmic Dawn and the Dark Ages. Currently operating radio telescopes have ushered in a data-driven era of 21-cm cosmology, providing the first constraints on the astrophysical properties of sources that drive this signal. However, extracting astrophysical information from the data is highly non-trivial and

    更新日期:2020-06-03
  • Multipole expansion for HI intensity mapping experiments: simulations and modelling
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-03
    Steven Cunnington; Alkistis Pourtsidou; Paula S Soares; Chris Blake; David Bacon

    We present a framework and an open-source python toolkit to analyse the 2-point statistics of 3D fluctuations in the context of H i intensity maps using the multipole expansion formalism. We include simulations of the cosmological H i signal using N-body and log-normal methods, foregrounds and their removal, as well as instrumental effects. Using these simulations and analytical modelling, we investigate

    更新日期:2020-06-03
  • Study of recent outburst in the Be/X-ray binary RX J0209.6−7427 with AstroSat: a new ultraluminous X-ray pulsar in the Magellanic Bridge?
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-03
    Amar Deo Chandra; Jayashree Roy; P C Agrawal; Manojendu Choudhury

    We present the timing and spectral studies of RX J0209.6–7427 during its rare 2019 outburst using observations with the Soft X-ray Telescope (SXT) and Large Area X-ray Proportional Counter (LAXPC) instruments on the AstroSat satellite. Pulsations having a periodicity of 9.29 s were detected for the first time by the NICER mission in the 0.2–10 keV energy band and, as reported here, by AstroSat over

    更新日期:2020-06-03
  • Recipes for bolometric corrections and Gaia luminosities of B-type stars: application to an asteroseismic sample
    Mon. Not. R. Astron. Soc. (IF 5.231) Pub Date : 2020-06-02
    Pedersen M, Escorza A, Pápics P, et al.

    ABSTRACTWe provide three statistical model prescriptions for the bolometric corrections appropriate for B-type stars as a function of (i) Teff, (ii) Teff and log g, and (iii)Teff, log g and [M/H]. These statistical models have been calculated for 27 different filters, including those of the Gaia space mission, and were derived based on two different grids of bolometric corrections assuming LTE and

    更新日期:2020-06-02
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