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Suzaku spectroscopy of extended X-ray emission in M 17

机译：朱雀光谱在M 17中扩展的X射线发射

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摘要

We present the results of a Suzaku spectroscopic study of soft extended X-ray emission in the H II region of M 17. 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 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 emission lines were clearly resolved for the first time, including K alpha lines of highly ionized O, Ne, and Mg as well as L-series complex of Fe at 0.5-1.5keV. Based on 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 similar to 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 similar to 2, (4) both the plasma temperature and the chemical composition of the diffuse emission show no spatial variation across the studied spatial scale of similar to 5 pc.
机译：我们展示了M 17的H II区域中软扩展X射线发射的Suzaku光谱研究的结果。使用X在空间上解析的方式以高信噪比获得了扩展发射的光谱射线成像光谱仪（XIS）。我们确定，未扣除点源，银河脊X射线发射，宇宙X射线背景和局部热气泡发射的污染在扣除了背景的XIS散射的XIS光谱中可忽略不计。首次明确解析了六条发射线，包括高电离的O，Ne和Mg的K alpha线以及0.5-1.5keV的Fe的L系列配合物。基于对这些线的诊断，我们获得了以下结果：（1）扩展发射是光学上较薄的热等离子体，其良好表现为单个温度类似于3.0 +/- 0.4 MK，（2）元素的丰度与散射光谱中的发射谱线为0.1-0.3太阳，而明亮的离散光源的发射谱线为0.3-1.5太阳，（3）散射发射中相对于彼此的金属丰度与太阳一致，除了Ne的增强因子类似于2，（4）在研究的类似于5 pc的空间尺度上，等离子体温度和扩散发射的化学成分均未显示任何空间变化。

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