Description
Chair: W. Iwakiri (Chiba Univ.)
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Tomokage Yoneyama (Chuo University)10/12/2024, 15:2030m
X-ray Imaging and Spectroscopy Mission (XRISM) has two X-ray instruments. Resolve, an X-ray microcalorimeter, has an extreme energy resolution of 5 eV at 6 keV. Xtend, an X-ray CCD array, has a large field of view (FoV) of 38 arcmin square, which gives us opportunities to observe many serendipitous sources. We developed the XRISM/Xtend Transient Search (XTS), a project to quick search and fast...
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Yohko Tsuboi (Chuo University)10/12/2024, 15:5030m
Since MAXI's launch in 2009, we have continuously surveyed stellar flares. The flare sample now exceeds 200 and has been found to originate from about 30 active stars, including RS CVn systems, Algol systems, dMe stars, dKe stars, YSOs, and undefined-type stars. The observed parameters of these MAXI flares are: luminosity of 10^31-10^34 erg s-1 in the 2-20 keV band, emission of 10^54-10^57...
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Miki Kurihara (UTokyo, ISAS)10/12/2024, 16:2015m
We detected a giant X-ray flare from the RS-CVn type binary star UX Ari using MAXI on 2020 August 17 and started a series of NICER observations 89 minutes later. For a week, the entire duration of the flare was covered with 32 snapshot observations including the rising phase. The X-ray luminosity reached 2$\times$10$^{33}$~erg~s$^{-1}$ and the entire energy release was $\sim 10^{38}$~erg in...
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Xuan Mao (National Astronomical Observatories, Chinese Academy of Sciences)poster
LEIA (Lobster Eye Imager for Astronomy) detected a new X-ray transient on November 7, 2022, identified as a superflare event occurring on a nearby RS CVn-type binary HD 251108. The flux increase was also detected in follow-up observations at X-ray, UV and optical wavelengths. The flare lasted for about forty days in soft X-ray observations, reaching a peak luminosity of ∼ 1.1 × 10^34 erg s^−1...
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Tomohiro Yanagi (Chuo University)poster
The X-ray Imaging Spectroscopy Mission (XRISM) was launched on September 7th 2023, and the onboard Xtend is now performing spectral imaging in the 0.4-13 keV band with a wide field of view of 38 arcminutes. “XRISM/Xtend Transient Search (XTS)” is a system to conduct a transient search by utilizing the wide field of view of Xtend once per a day. With the high sensitivity of about 10^-14 ergs^-1...
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Jingwei Hu (National Astronomical Observatories, Chinese Academy of Sciences)poster
The Einstein Probe (EP) is an interdisciplinary mission of time-domain and X-ray astronomy. It was launched into orbit from the Xichang satellite launch centre on January 9, 2024. From 2024 July the commissioning and calibration phase was successfully completed and the nominal operations phase has started. The Wide-field X-ray Telescope (WXT), one of the two main payloads on board EP, is to...
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Yukiko Ishihara (Chuo University)poster
XRISM/Xtend Transient Search (XTS) detected an X-ray flare from a Chandra X-ray source CXOGNC J104457.51-595429.5, which was identified with a Gaia source, DR2 5350302509372303744 or Cl Collinder 228 113 (ATel #16652). From the SED and the distance of ∼1.3 kpc, we found that Cl Collinder 228 113 has the spectrum type of K7 giant. The X-ray spectrum of this source has a strong Fe-K line at the...
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Nagisa Nagashima (Chuo univ.)poster
HR 1099 (V711 Tau) is one of the most active RS Canum Venaticorum binaries with an orbital period of 2.8377 days and has been extensively studied at various wavelengths. It is a non-eclipsing, double-lined spectroscopic binary with a K0 - K1 subgiant primary and a G5 dwarf secondary in a nearly circular orbit (Fekel 1983). We observed this object from March 6 to 10 (UT) with XRISM as one of...
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Anje Yoshimoto (Nara Women's University)poster
XRISM PV observation of the Galactic Center detected an interesting transient source named CXOU J174610.8-290019 within the Xtend FoV. The spectrum shows an intensity ratio of Fe-XXVI and Fe-XXV corresponding to kT>20 keV in comparison with a moderate bremsstrahlung continuum of kT~5 keV. We present the results of spectral and timing analyses.
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