巨大HII区N11的深钱德拉观测I.现场X射线源
A Deep Chandra Observation of the Giant HII Region N11 I. X-ray Sources in the Field
摘要：
利用钱德拉X射线天文台对大麦哲伦星系中的巨大HII区N11进行了非常灵敏的X射线研究。300 ks的观测揭示了亮度低至10^32 erg/s的X射线源，使该领域已知的点源数量增加了5倍以上。其中13颗大质量恒星（3个致密大质量恒星群，9颗O星和1颗早期B星）的log（Lx/Lbol）约为-6.5至-7，这可能表明它们是高磁性或碰撞风系统。另一方面，对应于未检测到的O星的区域的堆叠信号产生log（Lx/Lbol）~-7.3，即，尽管金属丰度较低，但发射水平与类似的银河系恒星相当。其他点源与N11中的11颗前景星、6颗晚B/A星和许多背景天体相吻合。这一观测也揭示了软扩散发射区的范围和详细的空间特性，但在它们的光谱中存在一些较热的等离子体，表明受到未解决的恒星星族的污染。
英文摘要：
A very sensitive X-ray investigation of the giant HII region N11 in the LMC was performed using the Chandra X-ray Observatory. The 300ks observation reveals X-ray sources with luminosities down to 10^32 erg/s, increasing by more than a factor of 5 the number of known point sources in the field. Amongst these detections are 13 massive stars (3 compact groups of massive stars, 9 O-stars and one early B-star) with log(Lx/Lbol)~-6.5 to -7, which may suggest that they are highly magnetic or colliding wind systems. On the other hand, the stacked signal for regions corresponding to undetected O-stars yields log(Lx/Lbol)~-7.3, i.e., an emission level comparable to similar Galactic stars despite the lower metallicity. Other point sources coincide with 11 foreground stars, 6 late-B/A stars in N11, and many background objects. This observation also uncovers the extent and detailed spatial properties of the soft, diffuse emission regions but the presence of some hotter plasma in their spectra suggests contamination by the unresolved stellar population.
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