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arXiv 1408.5146astro-ph.HE
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在RXTE时代观测到的低质量X射线双星瞬变的X射线爆发

X-ray outbursts of low-mass X-ray binary transients observed in the RXTE era

Zhen Yan, Wenfei Yu

摘要:

我们对1996- 2011年在{ \it RXTE}(\it Rossi X射线定时探测器)上的全天监测器(2- 12 keV)观测到的36个低质量X射线双星瞬变(LMXBT)中的110个明亮X射线爆发的性质进行了统计研究。我们已经测量了一些爆发的性质,包括峰值X射线光度,光度的变化率在每天的时间尺度,$e$折叠上升和衰减的时间尺度,爆发持续时间,和总辐射能量。我们发现,平均性能,如峰值X射线亮度,上升和衰减的时间尺度,爆发持续时间,和总辐射能量的黑洞LMXBT,至少是两倍以上的中子星LMXBT,这意味着这些属性的测量可能提供初步线索的性质紧凑的对象的一个新发现的LMXBT。我们还发现,爆发峰值X射线亮度与X射线亮度在上升相和衰变相的变化率相关,这与我们以前的研究是一致的。在爆发中还发现了总辐射能量与峰值X射线亮度之间以及总辐射能量与$e$折叠上升或衰减时标之间的正相关关系。这些相关性表明,在爆发之前储存在盘中的质量是建立稍后看到的爆发属性的主要初始条件。我们还发现,M31中两个瞬态恒星质量ULX的爆发也大致遵循相关性,这表明相同的爆发机制适用于M31中这两个源达到爱丁顿光度的更明亮的爆发。

英文摘要:

We have performed a statistical study of the properties of 110 bright X-ray outbursts in 36 low-mass X-ray binary transients (LMXBTs) seen with the All-Sky Monitor (2--12 keV) on board the {\it Rossi X-ray Timing Explorer} ({\it RXTE}) in 1996--2011. We have measured a number of outburst properties, including peak X-ray luminosity, rate of change of luminosity on a daily timescale, $e$-folding rise and decay timescales, outburst duration, and total radiated energy. We found that the average properties such as peak X-ray luminosity, rise and decay timescales, outburst duration, and total radiated energy of black hole LMXBTs, are at least two times larger than those of neutron star LMXBTs, implying that the measurements of these properties may provide preliminary clues as to the nature of the compact object of a newly discovered LMXBT. We also found that the outburst peak X-ray luminosity is correlated with the rate of change of X-ray luminosity in both the rise and the decay phases, which is consistent with our previous studies. Positive correlations between total radiated energy and peak X-ray luminosity, and between total radiated energy and the $e$-folding rise or decay timescale, are also found in the outbursts. These correlations suggest that the mass stored in the disk before an outburst is the primary initial condition that sets up the outburst properties seen later. We also found that the outbursts of two transient stellar-mass ULXs in M31 also roughly follow the correlations, which indicate that the same outburst mechanism works for the brighter outbursts of these two sources in M31 that reached the Eddington luminosity.

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