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arXiv 2007.10487astro-ph.HE
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IGR J17091-3624返回静止时的Swift/XRT、Chandra和XMM-牛顿观测

Swift/XRT, Chandra and XMM-Newton observations of IGR J17091-3624 as it returns into quiescence

Pereyra, Margarita, Altamirano, D., Court, J. M. C., Degenaar, N., Wijnands, R., Parikh, A. S., Cúneo, V. A

摘要:

IGR J17091-3624是一颗低质量X射线双星(LMXB),由于与明亮的黑洞系统GRS 1915+105的相似性而受到社会的广泛关注。这两个系统在爆发期间都表现出广泛的高度结构化的X射线变化,时间尺度从几秒到几十分钟,这使得它们在LMXB的质量吸积研究中是独一无二的。在这项工作中,我们对IGR J17091-3624的长期演化进行了总体概述,使用Swift/XRT观测从2011年2月2011-2013年爆发开始到2016年11月最后一次明亮爆发结束。在2011年爆发的衰变过程中,我们发现了4次再耀斑,但在后一次爆发中似乎没有类似的再耀斑。我们详细研究了过去10年中观测到的最低通量的时期,就在2011-2013年爆发的尾端,使用Chandra和XMM-牛顿观测。我们观察到的变化通量高达10倍,在此期间的相对平静,没有强有力的证据软化的光谱。这个结果表明,到目前为止,还没有观察到该源的真正静止。通过比较IGR J17091-3624在低光度下的光谱特性和对LMXB种群的充分研究,我们得出结论,IGR J17091-3624最有可能拥有一个黑洞作为紧凑的伴星,而不是一颗中子星。

英文摘要:

IGR J17091-3624 is a low mass X-ray binary (LMXB) which received wide attention from the community thanks to its similarities with the bright black hole system GRS 1915+105. Both systems exhibit a wide range of highly structured X-ray variability during outburst, with time scales from few seconds to tens of minutes, which make them unique in the study of mass accretion in LMXBs. In this work we present a general overview into the long-term evolution of IGR J17091-3624, using Swift/XRT observations from the onset of the 2011-2013 outburst in February 2011 to the end of the last bright outburst in November 2016. We found 4 re-flares during the decay of the 2011 outburst, but no similar re-flares appear to be present in the latter one. We studied in detail the period with the lowest flux observed in the last 10 years, just at the tail end of the 2011-2013 outburst, using Chandra and XMM-Newton observations. We observed changes in flux as high as a factor of 10 during this period of relative quiescence, without strong evidence of softening in the spectra. This result suggests that the source has not been observed at its true quiescence so far. By comparing the spectral properties at low luminosities of IGR J17091-3624 and those observed for a well studied population of LMXBs, we concluded that IGR J17091-3624 is most likely to host a black hole as a compact companion rather than a 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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