Discovery of X-rays from the protostellar outflow object HH2
Discovery of X-rays from the protostellar outflow object HH2
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DOI：
10.1038/35099508
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发表时间：
2001-10
期刊：
影响因子：
64.8
通讯作者：
S. Pravdo;E. Feigelson;G. Garmire;Y. Maeda;Y. Tsuboi;J. Bally
中科院分区：
文献类型：
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作者：
S. Pravdo;E. Feigelson;G. Garmire;Y. Maeda;Y. Tsuboi;J. Bally
50年来，赫比格-哈罗天体一直被认为是恒星形成区域中气体的发光凝聚体，但它们潜在的物理性质仍未得到阐明。先前提出的模型包括新生恒星，与星云物质碰撞的恒星风，被流出物冲击激发的密集星际气体口袋，以及星际“子弹”（参考文献）。射流激波模型最近取得了进展，在该模型中，物质从年轻的恒星物体中流出，并与周围的星际介质发生碰撞。该模型的一个明确预测是，能量最大的赫比格-哈罗天体将发射x射线，尽管迄今为止还没有探测到它们。在这里，我们报告了从赫比格-哈罗天体中最亮和最近的天体之一HH2中发现的x射线辐射，其水平与模型预测一致。我们得出结论，这个赫比格-哈罗天体在其前缘或其附近含有激波加热的物质，温度约为106K。
Herbig–Haro (HH) objects have been known,for 50 years to be luminous condensations of gas in star-forming regions, but their underlying physical nature is still being elucidated. Previously suggested models encompass newborn stars, stellar winds clashing with nebular material, dense pockets of interstellar gas excited by shocks from outflows, and interstellar ‘bullets’ (ref. ). Recent progress has been made with the jet-induced shock model, in which material streams out of young stellar objects and collides with the surrounding interstellar medium. A clear prediction of this model is that the most energetic Herbig–Haro objects will emit X-rays, although they have not hitherto been detected. Here we report the discovery of X-ray emission from one of the brightest and closest Herbig–Haro objects, HH2, at a level consistent with the model predictions. We conclude that this Herbig–Haro object contains shock-heated material located at or near its leading edge with a temperature of about 106K.