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arXiv 1105.5523astro-ph.HE
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Aql X-1的宽带谱分析

Broadband Spectral Analysis of Aql X-1

H. Raichur, R. Misra, G. Dewangan

摘要:

本文介绍了由朱雀和罗西X射线定时探测卫星观测到的瞬态低质量X射线双星Aql X-1的宽带光谱研究结果。在2007年爆发期间,在高/软(香蕉)状态和低/硬(极端岛屿)状态下观察到该源。香蕉状态和极端岛状态的光谱最好的描述由一个软多色黑体发射可能来自吸积盘和一个硬康普顿发射从边界层的两个组件模型组成。硬尾(延伸到~50千电子伏)的证据被发现在香蕉状态,这进一步(瞬态)组件,占至少~1.5%的源光度,是由幂律建模。Aql X-1是继GX 13+1之后第二个显示高能尾的环礁源。弱而宽的Fe线的存在为标准的吸积盘几乎延伸到中子星表面提供了进一步的支持。康普顿化边界层的输入光子可以是圆盘光子,也可以是恒星的隐藏表面,或者两者都有。边界层的光度与香蕉状态下的圆盘光度相似,而在极端岛状态下则大约大六倍。康普顿化边界层的温度从香蕉状态的~2 keV变化到极端岛状态的~20 keV。

英文摘要:

We present the results of a broadband spectral study of the transient Low Mass X-ray Binary Aql X-1 observed by Suzaku and Rossi X-ray Timing Explorer satellites. The source was observed during its 2007 outburst in the High/Soft (Banana) state and in the Low/Hard (Extreme Island) state. Both the Banana state and the Extreme Island state spectra are best described by a two component model consisting of a soft multi-colour blackbody emission likely originating from the accretion disk and a harder Comptonized emission from the boundary layer. Evidence for a hard tail (extending to ~50 keV) is found during the Banana state; this further (transient) component, accounting for atleast ~1.5% of the source luminosity, is modeled by a power-law. Aql X-1 is the second Atoll source after GX 13+1 to show a high energy tail. The presence of a weak but broad Fe line provides further support for a standard accretion disk extending nearly to the neutron star surface. The input photons for the Comptonizing boundary layer could either be the disk photons or the hidden surface of the star or both. The luminosity of the boundary layer is similar to the disk luminosity in the banana state and is about six times larger in the extreme island state. The temperature of the Comptonizing boundary layer changes from ~2 keV in the banana state to ~20 keV in the extreme island state.

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