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arXiv 0707.4074astro-ph
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M17中扩展X射线发射的Suzaku谱

Suzaku Spectroscopy of the Extended X-Ray Emission in M17

Yoshiaki Hyodo, Masahiro Tsujimoto, Kenji Hamaguchi, Katsuji Koyama, Shunji Kitamoto, Yoshitomo Maeda, Yohko Tsuboi, Yuichiro Ezoe

摘要:

我们提出的结果朱雀光谱研究的软扩展X射线发射的HII区M17。使用X射线成像光谱仪(XIS)以空间分辨的方式以高信噪比获得扩展发射的光谱。我们建立了未解决的点源,银河脊X射线发射,宇宙X射线背景,和本地热气泡排放的污染是可以忽略不计的背景扣除XIS光谱的扩散发射。首次清晰地分辨出6条发射线,包括0.5- 1.5keV高电离态O、Ne、Mg的K线和Fe的L系列络合物。基于对这些线路的诊断,我们获得了以下结果:(1)扩展发射是光学上薄的热等离子体,由3.0 +/-0.4MK的单一温度很好地表示,(2)在漫射光谱中具有发射线的元素的丰度为0.1--0.3太阳能,而明亮的离散源的丰度为0.3--1.5太阳能,(3)扩散辐射中金属元素的相对丰度与太阳辐射一致,但Ne元素的相对丰度增加了2倍。(4)扩散辐射的等离子体温度和化学成分在5 pc的空间尺度上没有空间变化。

英文摘要:

We present the results of a Suzaku spectroscopic study of the soft extended X-ray emission in the HII region M17. The spectrum of the extended emission was obtained with a high signal-to-noise ratio in a spatially-resolved manner using the X-ray Imaging Spectrometer (XIS). We established that the contamination by unresolved point sources, the Galactic Ridge X-ray emission, the cosmic X-ray background, and the local hot bubble emission is negligible in the background-subtracted XIS spectrum of the diffuse emission. Half a dozen of emission lines were resolved clearly for the first time, including K lines of highly ionized O, Ne, and Mg as well as L series complex of Fe at 0.5--1.5 keV. Based on the diagnosis of these lines, we obtained the following results: (1) the extended emission is an optically-thin thermal plasma represented well by a single temperature of 3.0 +/- 0.4 MK, (2) the abundances of elements with emission lines in the diffuse spectrum are 0.1--0.3 solar, while those of bright discrete sources are 0.3--1.5 solar, (3) the metal abundances relative to each other in the diffuse emission are consistent with solar except for a Ne enhancement of a factor of 2, (4) both the plasma temperature and the chemical composition of the diffuse emission show no spatial variation across the studied spatial scale of about 5 pc.

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