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arXiv 2102.07319astro-ph.HE
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奇特的X射线瞬变雨燕J0840 .7-3516:一个不寻常的低质量X射线双星还是一个潮汐破坏事件?

The Peculiar X-ray Transient Swift J0840.7-3516: an Unusual Low Mass X-ray Binary or a Tidal Disruption Event?

Megumi Shidatsu, Wataru Iwakiri, Hitoshi Negoro, Tatehiro Mihara, Yoshihiro Ueda, Nobuyuki Kawai, Satoshi Nakahira, Jamie A. Kennea, Phil A. Evans, Keith C. Gen… 展开作者

Megumi Shidatsu, Wataru Iwakiri, Hitoshi Negoro, Tatehiro Mihara, Yoshihiro Ueda, Nobuyuki Kawai, Satoshi Nakahira, Jamie A. Kennea, Phil A. Evans, Keith C. Gendreau, Teruaki Enoto, Francesco Tombesi

摘要:

我们使用Swift、MAXI、NICER和NuSTAR的大量数据,报告了2020年2月由Swift/BAT发现的新瞬态Swift J0840.7 $-$ 3516的X射线特性。发现后,源通量增加了$\sim 10^3$ s,在5天内迅速衰减超过$\sim$ 5个数量级,然后在9个月内几乎保持不变。在整个衰变过程中观察到1- $10^4$ s时间尺度上的大幅度短期变化。在初始通量上升时,源显示出硬幂律形状的光谱,其光子指数为$\sim 1.0$,延伸至$\sim 30$ keV,高于该keV时存在指数截止。光子指数在随后的快速衰变中增加,并在衰变结束时变为$\sim 2$。在3- 4keV处检测到一个光谱吸收特征。用任何已知的X射线源来解释所有观测到的性质是不容易的。我们讨论了可能的性质的来源,包括银河系低质量X射线二进制与多个极端的属性和潮汐中断事件的超大质量黑洞或银河系中子星。

英文摘要:

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 of Swift, MAXI, NICER, and NuSTAR. The source flux increased for $\sim 10^3$ s after the discovery, decayed rapidly over $\sim$ 5 orders of magnitude in 5 days, and then remained almost constant over 9 months. Large-amplitude short-term variations on time scales 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 $\sim 1.0$ extending up to $\sim 30$ keV, above which an exponential cutoff was present. The photon index increased in the following rapid decay and became $\sim 2$ 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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