X-ray outbursts of low-mass x-ray binary transients observed in the rxte era
X-ray outbursts of low-mass x-ray binary transients observed in the rxte era
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RXTE 时代观测到的低质量 X 射线双星瞬变的 X 射线爆发
DOI：
10.1088/0004-637x/805/2/87
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发表时间：
2015
影响因子：
4.9
通讯作者：
Yu Wenfei
中科院分区：
文献类型：
--
作者：
Yan Zhen;Yu Wenfei
我们对1996-2011年罗西X射线定时探测器（RXTE）上的全天监视器（2-12 keV）观测到的36个低质量X射线双星瞬变（LMXBTs）中110个明亮X射线爆发的特性进行了统计研究。我们已经测量了一些爆发的属性，包括峰值X射线光度，光度的变化率在每天的时间尺度上，e-折叠的上升和衰减的时间尺度，爆发持续时间，和总辐射能量。我们发现黑洞LMXBT的平均性质，如峰值X射线光度，上升和衰减时间尺度，爆发持续时间和总辐射能量，至少是中子星星LMXBT的两倍，这意味着这些性质的测量可能提供初步线索的紧凑对象的性质的一个新发现的LMXBT。我们还发现，爆发峰值X射线光度与X射线光度的变化率在上升和衰减阶段，这是与我们以前的研究一致。在爆发中还发现，总辐射能量与峰值X射线光度之间以及总辐射能量与e折叠上升或衰减时标之间存在正相关关系。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中两个瞬时恒星质量超亮X射线源的爆发也大致遵循相关性，这表明M31中这两个源达到爱丁顿光度的更亮爆发也适用相同的爆发机制。
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 Rossi X-ray Timing Explorer (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 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 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 ultraluminous X-ray sources 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.