Discovery of X-ray emission from the protostellar jet L1551 IRS5 (HH 154)
Discovery of X-ray emission from the protostellar jet L1551 IRS5 (HH 154)
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发现原恒星喷流 L1551 IRS5 (HH 154) 发射的 X 射线
DOI：
10.1051/0004-6361:20011387
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发表时间：
2001
影响因子：
6.5
通讯作者：
A. A. Kaas
中科院分区：
文献类型：
--
作者：
F. Favata;C. Fridlund;G. Micela;S. Sciortino;A. A. Kaas
我们第一次探测到与原恒星喷流有关的X射线发射，喷流来自L1551 IRS 5原恒星。IRS 5原恒星隐藏在一个非常大的吸收柱密度后面，使得直接观察喷流的发射成为可能。观测到的X射线辐射可能与激波工作面有关，即喷流和星周介质之间的界面。从喷流发出的X射线光度为LX' 3 10 29 erg s-1，是通常与年轻恒星日冕发射有关的光度的一个显著部分。X射线发射的光谱与热等离子体的热发射相一致，其温度为14 MK，高于射流撞击星周介质所产生的激波前沿的预期温度（基于射流的速度）。
We have for the rst time detected X-ray emission associated with a protostellar jet, on the jet emanating from the L1551 IRS5 protostar. The IRS5 protostar is hidden behind a very large absorbing column density, making the direct observation of the jet's emission possible. The observed X-ray emission is likely associated with the shock \working surface", i.e. the interface between the jet and the circumstellar medium. The X-ray luminosity emanating from the jet is, at LX' 3 10 29 erg s 1 , a signicant fraction of the luminosity normally associated with the coronal emission from young stars. The spectrum of the X-ray emission is compatible with thermal emission from a hot plasma, with a temperature of'4 MK, higher than the temperature expected (on the basis of the jet's velocity) for the shock front produced by the jet hitting the circumstellar medium.