1. Observations of the Ultra-compact X-ray Binary 4U 1543-624 in Outburst with NICER, INTEGRAL, Swift, and ATCA
- Author
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Gaurava K. Jaisawal, James Miller-Jones, Edward M. Cackett, Jonah Miller, Diego Altamirano, Peter Bult, Mark Reynolds, Tod E. Strohmayer, Lorenzo Natalucci, Andrew C. Fabian, Laura Shishkovsky, Keith C. Gendreau, Mariateresa Fiocchi, Javier A. García, Sebastien Guillot, Renee M. Ludlam, Abderahmen Zoghbi, Deepto Chakrabarty, Zaven Arzoumanian, Arash Bahramian, Institut de recherche en astrophysique et planétologie (IRAP), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Centre National d'Études Spatiales [Toulouse] (CNES), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), and Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Accretion ,010504 meteorology & atmospheric sciences ,Astrophysics::High Energy Astrophysical Phenomena ,X-ray binary ,Binary number ,FOS: Physical sciences ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,01 natural sciences ,Gravitation ,0103 physical sciences ,Astrophysics::Solar and Stellar Astrophysics ,Emission spectrum ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics ,0105 earth and related environmental sciences ,Line (formation) ,Physics ,High Energy Astrophysical Phenomena (astro-ph.HE) ,Accretion (meteorology) ,Plane (geometry) ,Astronomy and Astrophysics ,neutron [Stars] ,Neutron star ,13. Climate action ,Space and Planetary Science ,Accretion disks ,Astrophysics::Earth and Planetary Astrophysics ,Astrophysics - High Energy Astrophysical Phenomena ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] - Abstract
We report on X-ray and radio observations of the ultra-compact X-ray binary 4U 1543-624 taken in August 2017 during an enhanced accretion episode. We obtained NICER monitoring of the source over a $\sim10$ day period during which target-of-opportunity observations were also conducted with Swift, INTEGRAL, and ATCA. Emission lines were measured in the NICER X-ray spectrum at $\sim0.64$ keV and $\sim6.4$ keV that correspond to O and Fe, respectively. By modeling these line components, we are able to track changes in the accretion disk throughout this period. The innermost accretion flow appears to move inwards from hundreds of gravitational radii ($R_{g}=GM/c^{2}$) at the beginning of the outburst to $, Comment: 13 pages, 9 figures, 2 tables, accepted for publication in ApJ
- Published
- 2019
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