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arXiv 0712.0280astro-ph
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银河系中心区一颗特殊热星的朱雀X射线谱

Suzaku X-Ray Spectroscopy of a Peculiar Hot Star in the Galactic Center Region

Yoshiaki Hyodo, Masahiro Tsujimoto, Katsuji Koyama, Shogo Nishiyama, Tetsuya Nagata, Itsuki Sakon, Hiroshi Murakami, Hironori Matsumoto

摘要:

我们提出了一个明亮的点状源在银河系中心区域的6.7 keV强度图朱雀研究的结果。我们从X射线成像光谱仪获得的光谱中检测到一条等效宽度约为1 keV的强FeXXV 6.7 keV线以及高电离Ar和Ca的发射线。整个光谱由一个高度吸收的(~ 2x 10 ^{23}cm^{-2})薄热等离子体模型很好地描述,温度为3.8+/-0.6 keV,8 kpc时的亮度为~ 3x 10 ^{34} erg s^{-1}(2.0--8.0 keV)。的吸收,温度,光度,和6.7 keV线强度与存档的XMM-牛顿数据进行了确认。该源具有非常红色(J-KS=8.2等)的红外光谱能量分布(SED),该分布由~1000 K的黑体发射拟合,该黑体发射被~31等离子体的视觉消光衰减。高等离子体温度和大的X射线亮度与风-风碰撞沃尔夫-拉叶双星一致。SED的相似性的epsilon五重星系团成员的建议,源是一个WC型源。

英文摘要:

We present the results of a Suzaku study of a bright point-like source in the 6.7 keV intensity map of the Galactic center region. We detected an intense FeXXV 6.7 keV line with an equivalent width of ~1 keV as well as emission lines of highly ionized Ar and Ca from a spectrum obtained by the X-ray Imaging Spectrometer. The overall spectrum is described very well by a heavily absorbed (~2x10^{23}cm^{-2}) thin thermal plasma model with a temperature of 3.8+/-0.6 keV and a luminosity of ~3x10^{34} erg s^{-1} (2.0--8.0 keV) at 8 kpc. The absorption, temperature, luminosity, and the 6.7 keV line intensity were confirmed with the archived XMM-Newton data. The source has a very red (J-Ks=8.2 mag) infrared spectral energy distribution (SED), which was fitted by a blackbody emission of ~1000 K attenuated by a visual extinction of ~31 mag. The high plasma temperature and the large X-ray luminosity are consistent with a wind-wind colliding Wolf-Rayet binary. The similarity of the SED to those of the eponymous Quintuplet cluster members suggests that the source is a WC-type source.

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