Discovery of the Black Hole X-Ray Binary Transient MAXI J1348–630
Tominaga,Mayu1; Nakahira,Satoshi1; Shidatsu,Megumi2; Oeda,Motoki3; Ebisawa,Ken1; Sugawara,Yasuharu1; Negoro,Hitoshi4; Kawai,Nobuyuki3; Sugizaki,Mutsumi5; Ueda,Yoshihiro6; Mihara,Tatehiro7
Source PublicationThe Astrophysical Journal Letters
AbstractAbstract We report the first half-year monitoring of the new Galactic black hole candidate MAXI J1348–630, discovered on 2019 January 26 with the Gas Slit Camera on board the Monitor of All-sky X-ray Image (MAXI). During the monitoring period, the source exhibited two outburst peaks, where the first peak flux (at T?=?14 days from the discovery of T?=?0) was ~4 Crab (2–20 keV) and the second one (at T?=?132 days) was ~0.4 Crab (2–20 keV). The source exhibited distinct spectral transitions between the high/soft and low/hard states and an apparent “q”-shape curve on the hardness-intensity diagram, both of which are well-known characteristics of black hole binaries (BHBs). Compared to other bright black hole transients, MAXI J1348–630 is characterized by its low disk temperature (~0.75 keV at the maximum) and high peak flux in the high/soft state. The low peak temperature leads to a large innermost radius that is identified as the innermost stable circular orbit, determined by the black hole mass and spin. Assuming the empirical relation between the soft-to-hard transition luminosity (Ltrans) and the Eddington luminosity (LEdd), Ltrans/LEdd?≈?0.02, and a face-on disk around a non-spinning black hole, the source distance and the black hole mass are estimated to be D?≈?4 kpc and , respectively. The black hole is more massive if the disk is inclined and the black hole is spinning. These results suggest that MAXI J1348–630 may host a relatively massive black hole among the known BHBs in our Galaxy.
KeywordBlack holes Compact objects High energy astrophysics X-ray novae Stellar accretion disks
WOS IDIOP:2041-8205-899-1-abaaaa
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), 3-1-1 Yoshinodai, Chuo, Sagamihara, Kanagawa, 252-5210, Japan;
2.Department of Physics, Ehime University, 2-5, Bunkyocho, Matsuyama, Ehime 790-8577, Japan
3.Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
4.Department of Physics, Nihon University, 1-8-14 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-8308, Japan
5.National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Beijing 100012, People’s Republic of China
6.Department of Astronomy, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
7.High Energy Astrophysics Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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GB/T 7714
Tominaga,Mayu,Nakahira,Satoshi,Shidatsu,Megumi,等. Discovery of the Black Hole X-Ray Binary Transient MAXI J1348–630[J]. The Astrophysical Journal Letters,2020,899(1).
APA Tominaga,Mayu.,Nakahira,Satoshi.,Shidatsu,Megumi.,Oeda,Motoki.,Ebisawa,Ken.,...&Mihara,Tatehiro.(2020).Discovery of the Black Hole X-Ray Binary Transient MAXI J1348–630.The Astrophysical Journal Letters,899(1).
MLA Tominaga,Mayu,et al."Discovery of the Black Hole X-Ray Binary Transient MAXI J1348–630".The Astrophysical Journal Letters 899.1(2020).
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