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arXiv 0811.2663astro-ph
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用Suzaku研究黑洞候选者IGR J17497-2821的宽带谱

Broad-Band Spectrum of The Black Hole Candidate IGR J17497-2821 Studied with Suzaku

A. Paizis, K. Ebisawa, H. Takahashi, T. Dotani, T. Kohmura, M. Kokubun, J. Rodriguez, Y. Ueda, R. Walter, S. Yamada, K. Yamaoka, T. Yuasa

摘要:

介绍了INTEGRAL于2006年9月发现的IGR J17497-2821的1-300 keV朱雀谱。朱雀号在发现IGR J17497-2821八天后的9月25日观测到约53千秒的净曝光量。在朱雀观测期间,IGR J 17497 -2821非常明亮,在1-300 keV范围内,8 kpc时为2 x 10^37 erg/s,并显示出硬光谱,这是低硬态黑洞候选者的典型特征。尽管对源进行了多任务X射线监测,但只有朱雀号才有可能获得1-300 keV范围内的宽带谱,并具有非常高的信噪比。多色盘(DISKBB)和具有温和反射的热康普顿化分量(COMPPS)的总和是我们的IGR J17497-2821朱雀光谱的良好代表。吸积盘的光谱特性,以及在光谱中的截止能量在约150千电子伏的明确检测和约束。我们讨论的物理模型用于解释数据和与以前的结果比较的影响。

英文摘要:

The broad-band 1-300 keV Suzaku spectrum of IGR J17497-2821, the X-ray transient discovered by INTEGRAL in September 2006, is presented. Suzaku observed IGR J17497-2821 on September 25, eight days after its discovery, for a net exposure of about 53 ksec. During the Suzaku observation, IGR J17497-2821 is very bright, 2 x 10^37 erg/s at 8 kpc in the 1-300 keV range, and shows a hard spectrum, typical of black hole candidates in the low-hard state. Despite the multi-mission X-ray monitoring of the source, only with Suzaku is it possible to obtain a broad-band spectrum in the 1-300 keV range with a very high signal to noise ratio. A sum of a multi-color disc (DISKBB) and a thermal Comptonization component (COMPPS) with mild reflection is a good representation of our IGR J17497-2821 Suzaku spectrum. The spectral properties of the accretion disc as well as the cut-off energy in the spectrum at about 150 keV are clearly detected and constrained. We discuss the implications on the physical model used to interpret the data and the comparison with previous results.

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