Статья

The 2022 Outburst of IGR J17091–3624: Connecting the Exotic GRS 1915+105 to Standard Black Hole X-Ray Binaries

Jingyi WangMIT Kavli Institute for Astrophysics and Space Research, MIT, 70 Vassar Street, Cambridge, MA 02139, USAErin KaraMIT Kavli Institute for Astrophysics and Space Research, MIT, 70 Vassar Street, Cambridge, MA 02139, USAJavier A. GarcíaCahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125, USAD. AltamiranoSchool of Physics and Astronomy, University of Southampton, Highfield, Southampton, SO17 1BJ, UKT. BelloniINAF-Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, ItalyJames F. SteinerHarvard–Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USAM. van der KlisAstronomical Institute, Anton Pannekoek, University of Amsterdam, Science Park 904, NL-1098 XH, Amsterdam, The NetherlandsAdam IngramSchool of Mathematics, Statistics and Physics, Newcastle University, Herschel Building, Newcastle upon Tyne, NE1 7RU, UKGuglielmo MastroserioINAF-Osservatorio Astronomico di Cagliari, via della Scienza 5, I-09047 Selargius (CA), ItalyRiley ConnorsVillanova University, Department of Physics, Villanova, PA 19085, USAMatteo LucchiniAstronomical Institute, Anton Pannekoek, University of Amsterdam, Science Park 904, NL-1098 XH, Amsterdam, The NetherlandsThomas DauserRemeis Observatory & ECAP, Universität Erlangen-Nürnberg, D-96049 Bamberg, GermanyJoey NeilsenVillanova University, Department of Physics, Villanova, PA 19085, USACollin LewinMIT Kavli Institute for Astrophysics and Space Research, MIT, 70 Vassar Street, Cambridge, MA 02139, USARon A. RemillardMIT Kavli Institute for Astrophysics and Space Research, MIT, 70 Vassar Street, Cambridge, MA 02139, USAJ. HomanEureka Scientific, Inc., 2452 Delmer Street, Oakland, CA 94602, USA

2024en

ABI

Аннотация

Abstract While the standard X-ray variability of black hole X-ray binaries (BHXBs) is stochastic and noisy, there are two known BHXBs that exhibit exotic “heartbeat”-like variability in their lightcurves: GRS 1915+105 and IGR J17091–3624. In 2022, IGR J17091–3624 went into outburst for the first time in the NICER/NuSTAR era. These exquisite data allow us to simultaneously track the exotic variability and the corresponding spectral features with unprecedented detail. We find that as in typical BHXBs, the outburst began in the hard state, then continued in the intermediate state, but then transitioned to an exotic soft state, where we identify two types of heartbeat-like variability ( Class V and a new Class X ). The flux energy spectra show a broad iron emission line due to relativistic reflection when there is no exotic variability, and absorption features from highly ionized iron when the source exhibits exotic variability. Whether absorption lines from highly ionized iron are detected in IGR J17091–3624 is not determined by the spectral state alone, but rather is determined by the presence of exotic variability; in a soft spectral state, absorption lines are only detected along with exotic variability. Our finding indicates that IGR J17091–3624 can be seen as a bridge between the most peculiar BHXB GRS 1915+105 and “normal” BHXBs, because it alternates between the conventional and exotic behaviors of BHXBs. We discuss the physical nature of the absorbing material and exotic variability in light of this new legacy data set.

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Идентификаторы

DOI: 10.3847/1538-4357/ad1595

Цитирования и источники

Цитирований: 2Использованных источников: 0

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