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arXiv 0801.3315astro-ph
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天鹅座X-1在低/硬状态下的Suzaku结果

Suzaku Results on Cygnus X-1 in the Low/Hard State

Kazuo Makishima, Hiromitsu Takahashi, Shin'ya Yamada, Chris Done, Aya Kubota, Tadayasu Dotani, Ken Ebisawa, Takeshi Itoh, Shunji Kitamoto, Hitoshi Negoro, Yoshi… 展开作者

Kazuo Makishima, Hiromitsu Takahashi, Shin'ya Yamada, Chris Done, Aya Kubota, Tadayasu Dotani, Ken Ebisawa, Takeshi Itoh, Shunji Kitamoto, Hitoshi Negoro, Yoshihiro Ueda, Kazutaka Yamaoka

摘要:

2005年10月,朱雀X射线天文台对黑洞双星天鹅座X-1进行了17 ks的观测,当时它处于低/硬态,0.7-300 keV的光度为4.6 x 10^37 erg/s。XIS和HXD光谱,跨越0.7-400千电子伏,成功地复制了一个冷的吸积盘和热康普顿化日冕。电晕的特点是电子温度为~100 keV,和两个光学深度为~0.4和~1.5,分别占较硬和较软的连续。圆盘最里面的温度约为0.2 keV,被认为是突出到日冕的一半。圆盘不仅为康普顿云提供种子光子,而且产生软光谱过剩、温和的反射峰和弱加宽的铁谱线。与GRO J1655-40上的朱雀数据进行比较,揭示了几个有趣的光谱差异,这主要归因于倾角效应,假设圆盘具有平坦的几何形状,而日冕是大致球形的。一个强度排序光谱表明,连续变得不那么康普顿化时,源耀斑的时间尺度为1-200秒,而底层磁盘保持不变。

英文摘要:

The black-hole binary Cygnus X-1 was observed for 17 ks with the Suzaku X-ray observatory in 2005 October, while it was in a low/hard state with a 0.7-300 keV luminosity of 4.6 x 10^37 erg/s. The XIS and HXD spectra, spanning 0.7-400 keV, were reproduced successfully incorporating a cool accretion disk and a hot Comptonizing corona. The corona is characterized by an electron temperature of ~100 keV, and two optical depths of ~0.4 and ~1.5 which account for the harder and softer continua, respectively. The disk has the innermost temperature of ~0.2 keV, and is thought to protrude half way into the corona. The disk not only provides seed photons to the Compton cloud, but also produces a soft spectral excess, a mild reflection hump, and a weakly broadened iron line. A comparison with the Suzaku data on GRO J1655-40 reveals several interesting spectral differences, which can mostly be attributed to inclination effects assuming that the disk has a flat geometry while the corona is grossly spherical. An intensity-sorted spectroscopy indicates that the continuum becomes less Comptonized when the source flares up on times scales of 1-200 s, while the underlying disk remains unchanged.

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