A Comprehensive X-ray Report on AT2019wey

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dc.contributor.authorYao, Yuhan
dc.contributor.authorKulkarni, S. R.
dc.contributor.authorGendreau, K. C.
dc.contributor.authorJaisawal, Gaurava K.
dc.contributor.authorEnoto, Teruaki
dc.contributor.authorGrefenstette, Brian W.
dc.contributor.authorMarshall, Herman L.
dc.contributor.authorGarcia, Javier A.
dc.contributor.authorLudlam, R. M.
dc.contributor.authorPike, Sean N.
dc.contributor.authorNg, Mason
dc.contributor.authorZhang, Liang
dc.contributor.authorAltamirano, Diego
dc.contributor.authorJaodand, Amruta
dc.contributor.authorCenko, S. Bradley
dc.contributor.authorRemillard, Ronald A.
dc.contributor.authorSteiner, James F.
dc.contributor.authorNegoro, Hitoshi
dc.contributor.authorBrightman, Murray
dc.contributor.authorLien, Amy
dc.contributor.authorWolff, Michael T.
dc.contributor.authorRay, Paul S.
dc.contributor.authorMukai, Koji
dc.contributor.authorWadiasingh, Zorawar
dc.contributor.authorArzoumanian, Zaven
dc.contributor.authorKawai, Nobuyki
dc.contributor.authorMihara, Tatehiro
dc.contributor.authorStrohmayer, Tod E.
dc.date.accessioned2021-01-04T20:53:34Z
dc.date.available2021-01-04T20:53:34Z
dc.date.issued2020-11-30
dc.description.abstractThe Galactic low-mass X-ray binary AT2019wey (ATLAS19bcxp, SRGA J043520.9+552226, SRGE J043523.3+552234, ZTF19acwrvzk) was discovered as a new optical transient in Dec 2019, and independently as an X-ray transient in Mar 2020. In this paper, we present comprehensive NICER, NuSTAR, Chandra, Swift, and MAXI observations of AT2019wey from ~1 year prior to the discovery to the end of September 2020. AT2019wey appeared as a ~1 mCrab source and stayed at this flux density for several months, displaying a hard X-ray spectrum that can be modeled as a power-law with photon index Gamma~1.8. In June 2020 it started to brighten, and reached ~20 mCrab in ~2 months. The inclination of this system can be constrained to i<~30 deg by modeling the reflection spectrum. Starting from late-August (~59082 MJD), AT2019wey entered into the hard-intermediate state (HIMS), and underwent a few week-long timescale outbursts, where the brightening in soft X-rays is correlated with the enhancement of a thermal component. Low-frequency quasi-periodic oscillation (QPO) was observed in the HIMS. We detect no pulsation and in timing analysis of the NICER and NuSTAR data. The X-ray states and power spectra of AT2019wey are discussed against the landscape of low-mass X-ray binaries.en_US
dc.description.sponsorshipYY thanks the Heising–Simons Foundation for support. RML acknowledges the support of NASA through Hubble Fellowship Program grant HST-HF2-51440.001. JAG acknowledges support from NASA grant 80NSSC17K0515 and from the Alexander von Humboldt Foundation. ZW acknowledges support from the NASA postdoctoral program. This work was partially supported under NASA contract No. NNG08FD60C and made use of data from the NuSTAR mission, a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory, and funded by the National Aeronautics and Space Administration. We thank the NuSTAR Operations, Software, and Calibration teams for support with the execution and analysis of these observations. This research has made use of the NuSTAR Data Analysis Software (nustardas), jointly developed by the ASI Science Data Center (ASDC, Italy) and the California Institute of Technology (USA). NICER research at NRL is supported by NASA.en_US
dc.description.urihttps://arxiv.org/abs/2012.00160en_US
dc.format.extent20 pagesen_US
dc.genrejournal article preprintsen_US
dc.identifierdoi:10.13016/m2lahm-zfie
dc.identifier.citationYao, Yuhan; Kulkarni, S. R.; Gendreau, K. C.; Jaisawal, Gaurava K.; Enoto, Teruaki; Grefenstette, Brian W.; Marshall, Herman L.; Garcia, Javier A.; Ludlam, R. M.; Pike, Sean N.; Ng, Mason; Zhang, Liang; Altamirano, Diego; Jaodand, Amruta; Cenko, S. Bradley; Remillard, Ronald A.; Steiner, James F.; Negoro, Hitoshi; Brightman, Murray; Lien, Amy; Wolff, Michael T.; Ray, Paul S.; Mukai, Koji; Wadiasingh, Zorawar; Arzoumanian, Zaven; Kawai, Nobuyki; Mihara, Tatehiro; Strohmayer, Tod E.; A Comprehensive X-ray Report on AT2019wey; High Energy Astrophysical Phenomena (2020); https://arxiv.org/abs/2012.00160en_US
dc.identifier.urihttp://hdl.handle.net/11603/20281
dc.language.isoen_USen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department Collection
dc.relation.ispartofUMBC Faculty Collection
dc.relation.ispartofUMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rightsPublic Domain Mark 1.0*
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleA Comprehensive X-ray Report on AT2019weyen_US
dc.typeTexten_US

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