Quiescent X-ray variability from the neutron star transient Aql X-1 Quiescent variability from Aql X-1
Quiescent X-ray variability from the neutron star transient Aql X-1 Quiescent variability from Aql X-1
复制标题
中子星瞬变 Aql X-1 的静态 X 射线变异性 Aql X-1 的静态变异性
DOI：
10.1111/j.1365-2966.2011.18601.x
复制
发表时间：
2011
影响因子：
4.8
通讯作者：
Cackett E
中科院分区：
文献类型：
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作者：
Cackett E
许多研究揭示了中子星低质量x射线双星在静止期间的变异性。这种变异性没有很好地表征或理解，但可能是由于缺乏多次观察而错过的共同特性。观测到变率的一个这样的源是Aql X-1。在这里，我们分析了14个钱德拉和xmm -牛顿对Aql X-1的静止观测，覆盖了大约2年的周期。在这些时期之间有明显的变化，最显著的特征是耀斑样的通量增加了5倍。光谱拟合对于幂律和/或热成分是否可变尚无定论。我们认为，静止期间的可变性和耀斑样行为是由于可能到达中子星表面的低速率吸积所致。
A number of studies have revealed variability from neutron star low-mass X-ray binaries during quiescence. Such variability is not well characterized, or understood, but may be a common property that has been missed due to lack of multiple observations. One such source where variability has been observed is Aql X-1. Here, we analyse 14ChandraandXMM–Newtonobservations of Aql X-1 in quiescence, covering a period of approximately 2 yr. There is clear variability between the epochs, with the most striking feature being a flare-like increase in the flux by a factor of 5. Spectral fitting is inconclusive as to whether the power-law and/or thermal component is variable. We suggest that the variability and flare-like behaviour during quiescence is due to accretion at low rates which might reach the neutron star surface.