arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1407.7586astro-ph.HE
收藏

大麦云云中超级气泡N 70和N 185的漫射X射线辐射

Diffuse X-ray emission from the superbubbles N 70 and N 185 in the Large Magellanic Cloud

Jorge Reyes-Iturbide., Margarita Rosado., Ary Rodríguez-González., Pablo F. Velázquez., Mónica Sánchez-Cruces, Patricia Ambrocio-Cruz

摘要:

本文利用XMM-牛顿卫星的观测资料,对位于大麦云云中的N 70(DEM L301)和N 185(DEM L25)超级气泡的X射线散射辐射进行了研究。我们获得了这些物体在软X射线能带的光谱和图像。这些X射线光谱由热等离子体模型拟合,对于N 70和N 185,温度分别为$2.6 \times 10^{6}$ K和$2.3 \times 10^{6}$ K。通过比较X射线和光学辐射的分布,发现N70的X射线辐射来自于超泡内部;而N185的X射线辐射部分受到光学壳层的限制。我们认为观测到的X射线发射是由光学壳层内部的激波加热气体引起的。我们还获得了超过标准分析模型预测值的X射线光度。这一事实表明,除了内部恒星的风之外,在描述中还需要考虑另一个因素,例如超新星爆炸,这在以前的数值模型中已经提出过。

英文摘要:

We present a study of the diffuse X-ray emission from superbubbles N 70 (DEM L301) and N 185 (DEM L25) located in the Large Magellanic Cloud, based on data from the XMM-Newton Satellite. We obtained spectra and images of these objects in the soft X-ray energy band. These X-ray spectra were fitted by a thermal plasma model, with temperatures of $2.6 \times 10^{6}$ K and $2.3 \times 10^{6}$ K, for N 70 and N 185, respectively. For N 70, images show that X-ray emission comes from the inner regions of the superbubble, when we compare the distribution of the X-ray and the optical emission; while for N 185, the X-ray emission is partially confined by the optical shell. We suggest that the observed X-ray emission is caused by shock-heated gas, inside of the optical shells. We also obtained X-ray luminosities which exceed the values predicted by the standard analytical model. This fact shows that, in addition to the winds of the interior stars, it is necessary to consider another ingredient in the description, such as a supernova explosion, as has been proposed in previous numerical models.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑