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
AbstractWe 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 similar to 4 Crab (2-20 keV) and the second one (at T = 132 days) was similar to 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 (similar to 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 (L-trans) and the Eddington luminosity (L-Edd), L-trans/L-Edd approximate to 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 approximate to 4 kpc and similar to 7(D/4kpc)M-circle dot. 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 Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000561530100001
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Document Type期刊论文
Corresponding AuthorTominaga, Mayu
Affiliation1.Japan Aerosp Explorat Agcy JAXA, Inst Space & Astronaut Sci ISAS, Chuo Ku, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 2525210, Japan
2.Ehime Univ, Dept Phys, 2-5 Bunkyocho, Matsuyama, Ehime 7908577, Japan
3.Tokyo Inst Technol, Dept Phys, Meguro Ku, 2-12-1 Ookayama, Tokyo 1528551, Japan
4.Nihon Univ, Dept Phys, Chiyoda Ku, 1-8-14 Kanda Surugadai, Tokyo 1018308, Japan
5.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100012, Peoples R China
6.Kyoto Univ, Dept Astron, Sakyo Ku, Kitashirakawa Oiwake Cho, Kyoto 6068502, Japan
7.RIKEN, High Energy Astrophys Lab, 2-1 Hirosawa, Wako, Saitama 3510198, Japan
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Tominaga, Mayu,Nakahira, Satoshi,Shidatsu, Megumi,et al. Discovery of the Black Hole X-Ray Binary Transient MAXI J1348-630[J]. ASTROPHYSICAL JOURNAL LETTERS,2020,899(1):6.
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.ASTROPHYSICAL JOURNAL LETTERS,899(1),6.
MLA Tominaga, Mayu,et al."Discovery of the Black Hole X-Ray Binary Transient MAXI J1348-630".ASTROPHYSICAL JOURNAL LETTERS 899.1(2020):6.
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