The Peculiar X-Ray Transient Swift J0840.7-3516: An Unusual Low-mass X-Ray Binary or a Tidal Disruption Event?

被引：1

作者：

Shidatsu, Megumi ^{[1
]}

Iwakiri, Wataru ^{[2
]}

Negoro, Hitoshi ^{[3
]}

Mihara, Tatehiro ^{[4
]}

Ueda, Yoshihiro ^{[5
]}

Kawai, Nobuyuki ^{[6
]}

Nakahira, Satoshi ^{[7
]}

Kennea, Jamie A. ^{[8
]}

Evans, Phil A. ^{[9
]}

Gendreau, Keith C. ^{[10
]}

Enoto, Teruaki ^{[11
]}

Tombesi, Francesco ^{[12
,13
,14
,15
]}

机构：

[1] Ehime Univ, Dept Phys, 2-5 Bunkyocho, Matsuyama, Ehime 7908577, Japan

[2] Chuo Univ, Dept Phys, Fac Sci & Engn, Bunkyo Ku, 1-13-27 Kasuga, Tokyo 1128551, Japan

[3] Nihon Univ, Dept Phys, Chiyoda Ku, 1-8-14 Kanda Surugadai, Tokyo 1018308, Japan

[4] RIKEN, High Energy Astrophys Lab, 2-1 Hirosawa, Wako, Saitama 3510198, Japan

[5] Kyoto Univ, Dept Astron, Sakyo Ku, Kitashirakawa Oiwake Cho, Kyoto, Kyoto 6068502, Japan

[6] Tokyo Inst Technol, Dept Phys, Meguro Ku, 2-12-1 Ookayama, Tokyo 1528551, Japan

[7] Japan Aerosp Explorat Agcy JAXA, Inst Space & Astronaut Sci ISAS, Chuo Ku, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 2525210, Japan

[8] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

[9] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England

[10] NASA, Astrophys Sci Div, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[11] RIKEN, Cluster Pioneering Res, 2-1 Hirosawa, Wako, Saitama 3510198, Japan

[12] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

[13] NASA, Goddard Space Flight Ctr, Code 662, Greenbelt, MD 20771 USA

[14] Tor Vergata Univ Rome, Dept Phys, Via Ric Sci 1, I-00133 Rome, Italy

[15] INAF Astron Observ Rome, Via Frascati 33, I-00078 Monte Porzio Catone, Italy

来源：

ASTROPHYSICAL JOURNAL | 2021年 / 910卷 / 02期

关键词：

X-ray transient sources; Low-mass x-ray binary stars; Tidal disruption; BLACK-HOLE; COMPLETE SAMPLE; LIGHT CURVES; SOLAR MASSES; STAR; ACCRETION; AFTERGLOW; ABSORPTION; VARIABILITY; LUMINOSITY;

D O I：

10.3847/1538-4357/abe6a1

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on the X-ray properties of the new transient Swift J0840.7-3516, discovered with Swift/BAT in 2020 February, using extensive data from Swift, MAXI, NICER, and NuSTAR. The source flux increased for similar to 10(3) s after the discovery, decayed rapidly over similar to 5 orders of magnitude in five days, and then remained almost constant over nine months. Large-amplitude short-term variations on timescales of 1-10(4) s were observed throughout the decay. In the initial flux rise, the source showed a hard power-law-shaped spectrum with a photon index of similar to 1.0 extending up to similar to 30 keV, above which an exponential cutoff was present. The photon index increased in the following rapid decay and became similar to 2 at the end of the decay. A spectral absorption feature at 3-4 keV was detected in the decay. It is not straightforward to explain all the observed properties by any known class of X-ray sources. We discuss the possible nature of the source, including a Galactic low-mass X-ray binary with multiple extreme properties and a tidal disruption event by a supermassive black hole or a Galactic neutron star.

引用

页数：11

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