XRISM/Xtend Transient Search (XTS) detected an outburst from a white dwarf candidate

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dc.contributor.authorNagashima, N.
dc.contributor.authorFukushima, K.
dc.contributor.authorKanemaru, Y.
dc.contributor.authorPottschmidt, Katja
dc.contributor.authoret al
dc.date.accessioned2025-10-03T19:33:43Z
dc.date.issued2025-04-14
dc.descriptionAuthors: N. Nagashima (Chuo U.), K. Fukushima, Y. Kanemaru, S. Ogawa (JAXA), M. Audard (U. de Geneve), E. Behar (Technion), S. Inoue (Kyoto U.), Y. Ishihara (Chuo U.), T. Kohmura (TUS), Y. Maeda (JAXA), M. Mizumoto (UTEF), M. Nobukawa (NUE), K. Pottschmidt (UMBC, NASA GSFC, CRESST), M. Shidatsu (Ehime U.), H. Sugai (Chuo U.), Y. Terada (Saitama U.), Y. Terashima (Ehime U.), Y. Tsuboi (Chuo U.), H. Uchida (Kyoto U.), T. Yoneyama (Chuo U.), M. Yoshimoto (Ehime U.)
dc.description.abstractXRISM/Xtend Transient Search (XTS) detected an X-ray outburst from an X-ray source XRISM J1826-3651 on 2025-04-12 TT. The source position is determined to be (R.A., Dec.) = (276.543, -36.849), with a systematic error of ~40 arcsec. A plausible counterpart is a white dwarf candidate Gaia DR3 6728071049507752320, which is located ~16 arcsec apart from the position of XRISM J1826-3651. The XRISM observation was started at 2025-04-12T18:07:19 TT, where the flux was estimated to be 8 × 10⁻¹⁴ erg s⁻¹ cm⁻² (0.4 – 10.0 keV). The source flux was increased by an order of magnitude (8 × 10⁻¹³ erg s⁻¹ cm⁻²) by 2025-04-12 at ~22:52 TT. The outburst was continuing at the end of the observation, 2025-04-13T02:55:13 TT. Corresponding luminosities were 3 × D₁.₇ ₖₚ꜀² × 10³¹ erg s⁻¹ and 3 × D₁.₇ ₖₚ꜀² × 10³² erg s⁻¹, respectively by assuming the distance to XRISM J1826-3651 of D₁.₇ ₖₚ꜀. We derived the above systematic error for the flux by comparing our derived values for the sources detected with XTS in several observations with those for the corresponding X-ray counterparts. We estimated the systematic error for the source position from the separations between the detected sources with the corresponding counterparts in the same field of view.
dc.description.urihttps://www.astronomerstelegram.org/?read=17145
dc.format.extent2 pages
dc.genrearticles
dc.identifierdoi:10.13016/m2vbet-ceck
dc.identifier.citationNagashima, N., K. Fukushima, Y. Kanemaru, K. Pottschmidt, et al. “XRISM/Xtend Transient Search (XTS) Detected an Outburst from a White Dwarf Candidate.” The Astronomer’s Telegram, April 14, 2025. https://www.astronomerstelegram.org/?read=17145.
dc.identifier.urihttp://hdl.handle.net/11603/40312
dc.language.isoen
dc.publisherThe Astronomer's Telegram
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
dc.relation.ispartofUMBC Faculty Collection
dc.relation.ispartofUMBC Physics Department
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.titleXRISM/Xtend Transient Search (XTS) detected an outburst from a white dwarf candidate
dc.typeText
dcterms.creatorhttps://orcid.org/0000-0002-4656-6881

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