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arXiv 1503.01238astro-ph.HE
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银河系黑洞候选者Swift J1753 .5-0127的低/硬态中的重复短期光谱软化

Repeated Short-term Spectral Softening in the Low/Hard State of the Galactic Black-Hole Candidate Swift J1753.5-0127

Akifumi Yoshikawa, Shin'ya Yamada, Satoshi Nakahira, Masaru Matsuoka, Hitoshi Negoro, Tatehiro Mihara, Toru Tamagawa

摘要:

我们报告了MAXI和Swift观测银河系黑洞X射线双星Swift J1753.5-0127在低/硬态的短期光谱软化。这些软化事件的特征在于持续数十天的软X射线(2- 4keV)的同时增加和硬X射线(15-50 keV)的减少。软化期的X射线能谱可用多色盘黑体及其康普顿化分量组成的模型再现。当光谱变软时,康普顿化分量的分数从0.30降低到0.15;同时,内盘温度(Tin)从0.2增加到0.45 keV。这些结果意味着软化事件是由质量吸积速率的短期增加触发的。在观测到的光谱软化事件中,圆盘通量(F)和Tin并不遵循以下关系:F与Tin成正比^[4],这表明圆盘的内半径并没有达到最内侧的稳定圆形轨道。

英文摘要:

We report MAXI and Swift observations of short-term spectral softenings of the galactic black-hole X-ray binary Swift J1753.5-0127 in the low/hard state. These softening events are characterized by a simultaneous increase of soft X-rays (2-4 keV) and a decrease of hard X-rays (15-50 keV) lasting for a few tens of days. The X-ray energy spectra during the softening periods can be reproduced with a model consisting of a multi-color disk blackbody and its Comptonized component. The fraction of the Comptonized component decreased from 0.30 to 0.15 when the spectrum became softer; meanwhile the inner disk temperature (Tin) increased from 0.2 to 0.45 keV. These results imply that the softening events are triggered by a short-term increase of the mass accretion rate. During the observed spectral softening events, the disk flux (F) and Tin did not obey the relation: F is proportional to Tin^4, suggesting that the inner disk radius does not reach the innermost stable circular orbit.

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