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arXiv 0704.0346astro-ph
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用朱雀观测船底座星云的弥散X射线发射

Diffuse X-ray Emission from the Carina Nebula Observed with Suzaku

Kenji Hamaguchi, the Suzaku Eta Carinae team, the Carinae D-1 team

摘要:

一些巨大的HII区与软扩散X射线发射有关。其中船底座星云拥有最明亮的软漫射辐射。所需的等离子体温度和热能可以通过碰撞或终止主序星或嵌入的年轻O星的快风来产生,但扩展的发射通常是在远离大质量星团的区域观察到的。X射线发射的来源不明。朱雀星上搭载的XIS CCD相机具有迄今为止扩展软源的最佳光谱分辨率,因此能够测量软波段的关键发射线。朱雀号分别于2005年8月和2006年6月对船底座星云(Car-D1)的核心和东侧进行了观测。核心南部和Car-D1的光谱同样显示出强的铁离子L-壳层线和硅离子K-壳层线,而在核心北部,这些线要弱得多。用吸收的薄热等离子体模型拟合的光谱显示kT~0.2,0.6keV和NH~1- 2 e ~(21)cm ~(-2),其中氧、镁、硅和铁的丰度变化为2-3倍。等离子体可能起源于一颗古老的超新星,或者是多颗超新星的超级壳层。

英文摘要:

A number of giant HII regions are associated with soft diffuse X-ray emission. Among these, the Carina nebula possesses the brightest soft diffuse emission. The required plasma temperature and thermal energy can be produced by collisions or termination of fast winds from main-sequence or embedded young O stars, but the extended emission is often observed from regions apart from massive stellar clusters. The origin of the X-ray emission is unknown. The XIS CCD camera onboard Suzaku has the best spectral resolution for extended soft sources so far, and is therefore capable of measuring key emission lines in the soft band. Suzaku observed the core and the eastern side of the Carina nebula (Car-D1) in 2005 Aug and 2006 June, respectively. Spectra of the south part of the core and Car-D1 similarly showed strong L-shell lines of iron ions and K-shell lines of silicon ions, while in the north of the core these lines were much weaker. Fitting the spectra with an absorbed thin-thermal plasma model showed kT~0.2, 0.6 keV and NH~1-2e21 cm-2 with a factor of 2-3 abundance variation in oxygen, magnesium, silicon and iron. The plasma might originate from an old supernova, or a super shell of multiple supernovae.

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