仙王座A的钱德拉观测：HH 168的漫发射得到解决
Chandra observation of Cepheus A: The diffuse emission of HH 168 resolved
摘要：
在几种情况下，已经探测到了来自大质量恒星外流的X射线辐射。我们提出了一个钱德拉观察HH 168，并表明软X射线发射从HH 168内的等离子体的0.55千电子伏的扩散。X射线发射是在两个不同的尺度上观察到的：三个独立的，但扩展的区域嵌入在一个低X射线表面亮度的复合体中。与弓形激波相比，辐射的位移与流出方向相反.我们表明，没有显着的贡献，从年轻的恒星物体（YSO），并讨论了几个冲击的情况下，可以产生所观察到的签名。我们建立了HH 168的X射线发射是由内部冲击激发的，与简单模型相反，简单模型预计弓形冲击是最明亮的X射线。
英文摘要：
X-ray emission from massive stellar outflows has been detected in several cases. We present a Chandra observation of HH 168 and show that the soft X-ray emission from a plasma of 0.55 keV within HH 168 is diffuse. The X-ray emission is observed on two different scales: Three individual, yet extended, regions are embedded within a complex of low X-ray surface brightness. Compared to the bow shock the emission is displaced against the outflow direction. We show that there is no significant contribution from young stellar objects (YSOs) and discuss several shock scenarios that can produce the observed signatures. We establish that the X-ray emission of HH 168 is excited by internal shocks in contrast to simple models, which expect the bow shock to be the most X-ray luminous.
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