XRISM/Xtend Transient Search (XTS) detected an X-ray flare from an eclipsing binary

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https://www.astronomerstelegram.org/?read=17144

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http://hdl.handle.net/11603/40313

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UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
UMBC Faculty Collection
UMBC Physics Department

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Author/Creator ORCID

https://orcid.org/0000-0002-4656-6881

Date

2025-04-14

Type of Work

articles
Text

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Citation of Original Publication

Ishihara, Y., K. Fukushima, Y. Kanemaru, K. Pottschmidt, et al. “XRISM/Xtend Transient Search (XTS) Detected an X-Ray Flare from an Eclipsing Binary.” The Astronomer’s Telegram, April 14, 2025. https://www.astronomerstelegram.org/?read=17144.

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Abstract

XRISM/Xtend Transient Search (XTS) detected an X-ray flare from an X-ray source XRISM J1746-2940 on 2025-04-12 TT. The source position is determined to be (R.A., Dec.) = (266.528, -29.671), with a systematic error of ~ 40 arcsec. A plausible counterpart is an eclipsing binary V734 Sgr located ~ 10 arcsec apart from the position of XRISM J1746-2940. The flare started at 2025-04-12 at ~ 12:38 TT. The flare reached its peak on 2025-04-12 at ~ 13:12. The flare exponentially decayed in 10⁴ sec. The peak flux is estimated to be 2 × 10⁻¹¹ erg s⁻¹ cm⁻² (0.4 – 10.0 keV). A systematic error of roughly 20% should be added to the statistical error. Corresponding luminosity is 2 × D₉₇₈ₚ꜀ × 10³³ erg s⁻¹ by assuming the distance to XRISM J1746-2940 of D₉₇₈ₚ꜀. 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.