Discovery of Nonthermal X-Ray Emission from the Embedded Massive Star-forming Region RCW 38
Discovery of Nonthermal X-Ray Emission from the Embedded Massive Star-forming Region RCW 38
复制标题
发现嵌入式大质量恒星形成区域 RCW 38 的非热 X 射线发射
DOI：
10.1086/345611
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
J. Alves
中科院分区：
文献类型：
--
作者：
S. Wolk;T. Bourke;Randall K. Smith;B. Spitzbart;J. Alves
我们报告了用96.7k钱德拉观测到的最年轻、嵌入最多、质量最大的年轻星团之一的X射线观测结果--RCW38。我们发现了一个约1.25×1.75pC的扩展发射区。该发射与同步辐射是一致的。发射的功率指数向星团核心陡峭，这意味着磁场是从那里产生的。这是同步辐射填补活跃恒星形成区域的第一个证据。所需磁场的来源尚不清楚。我们测量了氢柱对发射的影响，发现NH从7.6×1021增加到1.61×1022 cm-2，从星系团的西北向东南象限增加，与近红外消光数据一致。
We report on results of a 96.7 ks Chandra observation of one of the youngest, most embedded and massive young stellar clusters studied to date in X-rays—RCW 38. We find a region of extended emission about 1.25 × 1.75 pc. The emission is consistent with synchrotron emission. The power index of the emission steepens toward the cluster core, implying that the magnetic field originates there. This is the first evidence of synchrotron emission filling a region of active star formation. The source of the necessary magnetic field is unclear. We measure the hydrogen column to the emission and find that NH increases from 7.6 × 1021 to 1.61 × 1022 cm-2, increasing from the northwest to the southeast quadrants of the cluster, consistent with near-infrared extinction data.