Description
Chair: H. Negoro (Nihon-u)
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Megumi Shidatsu (Ehime University)11/12/2024, 13:4030m
Since the start of the operation in 2009, MAXI has detected many outbursts from newly discovered and known Galactic black hole and neutron star X-ray binaries. They were promptly reported to the astronomical community over the world, which stimulated follow-up observations at various wavelengths. MAXI itself also provided unique long-term X-ray data covering their entire outburst periods,...
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Melania Del Santo (INAF/IASF Palermo)11/12/2024, 14:1015m
The X-ray transient MAXI J1810-222 was discovered by MAXI in 2018 and has been active ever since. A long, combined radio and X-ray monitoring campaign was performed with ATCA and Swift, respectively. It gas been identified as a black hole candidate, even though the highly unusual outburst behaviour and the absence of information regarding the distance or the donor leaves the nature of the...
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Ruchika Dhaka (Indian Institute of Technology Kanpur)11/12/2024, 14:2515m
In this study, we undertake a spectral-timing analysis of the black hole X-ray binary source GRS 1915+105 using simultaneous observations carried out by AstroSat and NICER. The source showed two flux levels (high and low), whose energy spectra can be described by the thermal comptonization of disk photons. The spectral parameters obtained by the joint fitting of SXT/LAXPC and NICER/LAXPC were...
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Stéphane Corbel (Univ. Paris Cité / CEA Saclay / Observatoire de Paris)11/12/2024, 14:4030m
Since the launch of MAXI 15 years ago, several considerable achievements have been reached in the field of Galactic accreting binary systems, especially in light of the extreme variability of their relativistic jets. These jets have now been recognized as vital component for energy transfer and angular momentum in black holes. Although the phenomenology is now rather well established, their...
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Dipak Debnath (Insttute of Astronomy Space and Earth Science)poster
MAXI is one of the most successful astronomy mission satellites which discovered 14 Galactic X-ray binaries to date. We studied the accretion flow properties of 7 black hole candidates (BHCs; such as MAXI J1659-152, MAXI J1836-194, MAXI J1543-564, MAXI J1535-571, MAXI J1348-630, MAXI J1813-095, MAXI J1910-057) using one of the generalized physical accretion flow models, namely Two-component...
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164. Discovery of the black hole X-ray nova MAXI J1631-479 and understanding its peculiar propertiesKohei Kobayashi (Nihon University (Current Affiliation: MAMEZOU CO., LTD))poster
MAXI J1631-479 was discovered on 2018 December 21 by MAXI, and exhibited a fast rise and exponential decay type of the outburst. After the low/hard state at the beginning of the outburst, the source underwent a variety of state transitions. The source, however, had been mostly in the high/soft state after about 100 days from the discovery until the X-ray flux decreased by about four orders of...
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Saien Xu (School of Physics and Technology, Wuhan University)poster
Black hole X-ray binaries (BHXRBs) undergo hard-soft-hard state during their outbursts. In the soft state, the energy spectrum is dominated by thermal emission from the accretion disk, which is thought to extend down to the innermost stable circular orbit. In contrast, during the hard state, the disk is truncated at a larger radius, and the spectrum is dominated by a comptonization component...
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Mariko Kimura (Kanazawa univ.)poster
MAXI J1820+070 is a low-mass X-ray binary harboring a black hole. It entered a very bright outburst in 2018. We performed shot analyses of X-ray and optical sub-second flares observed during the low/hard state of that outbursts. The advantage of shot analyses is that the average flare shape can be preserved. We found that the timescale of shots was about 0.2 s and that optical shots were less...
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Taichi Nakamoto (Ehime University)poster
We report the results of X-ray spectral analysis of the Galactic black hole X-ray binary Swift J1727.8-1613 during its outburst. It showed one of the largest outbursts ever observed in black hole X-ray binaries and was monitored by many X-ray observatories. Using the NICER spectra obtained at various epochs in the outburst, we investigated the accretion disk structure and its evolution. We...
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Xiang Ma (Institute of High Energy Physics, CAS)poster
We report the X-ray timing results of the black hole candidate MAXI J1820+070 during its 2018 outburst using the Hard X-ray Modulation Telescope (Insight-HXMT) and Neutron Star Interior Composition Explorer Mission (NICER) observations. Low-frequency quasi-periodic oscillations (LFQPOs) are detected in the low/hard state and the hard intermediate state, which lasted for ∼90 days. Thanks to the...
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Chulsoo Kang (Ehime University)poster
The black hole X-ray binary 4U 1630-472 shows outbursts repeatedly with an interval of 600 days. We studied the 2012 outburst, which was one of the biggest outbursts of the source. We found unusual X-ray flux drops by ~50% with a duration of ~1 day at its brightest phase, which is much shorter than the timescale of accretion but longer than the dynamical timescale in the inner region of the...
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Kazutaka Yamaoka (Nagoya Univ.)poster
We compiled the X-ray and soft gamma-ray observations of the Galactic black hole binary XTE J1859+226 in the 1999–2000 outburst from RXTE, ASCA, BeppoSAX and CGRO. Throughout systematic spectral analysis using a two-component model consisting of a multi-temperature accretion disk plus a fraction of its flux convolved with a phenomenological cutoff powerlaw component resembling Comptonizaion,...
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