On Search and Detection of Hard X-Ray Emission from Orion-Like Complexes Produced by a Flux of Subrelativistic Nuclei
On Search and Detection of Hard X-Ray Emission from Orion-Like Complexes Produced by a Flux of Subrelativistic Nuclei
复制标题
亚相对论核通量产生的类猎户座复合体的硬X射线发射的搜索和探测
DOI：
10.1093/pasj/50.6.567
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发表时间：
1998
影响因子：
2.3
通讯作者：
K. Masai
中科院分区：
文献类型：
--
作者：
V. Dogiel;A. Ichimura;H. Inoue;K. Masai
我们分析了 COMPTEL 望远镜发现的猎户座 7 射线的起源，以及用 X 射线望远镜搜索类猎户座源的可能性。我们已经证明，如果这些 7 射线是由碳和氧亚相对论核通量产生的（正如通常假设的那样），那么我们预计会出现连续的线 X 射线发射通量。我们表明，除了轫致辐射和逆轫致辐射之外，连续 X 射线通量的很大一部分是由背景电子的辐射捕获产生的。计算还表明，如果原子核充满了猎户座复合体的整个体积，则 6.4 keV 铁线是猎户座 X 射线光谱中最突出的。线通量估计为 Lx ~ 4 • 10 40ph s"1。由于预计发射区域会扩大（总面积约为 100 平方度），因此近地线的强度为 4.6 • 10~ 3ph cm"2s~1sr~1。该值低于ASCA望远镜的3<x水平。因此，用X射线望远镜寻找遥远的（点状）类猎户座候选者似乎更有远见。作为一个例子，我们分析了 ASCA 观测到的 6.4 keV 铁线在银心方向的通量。如果这条线是由银河系中心的类猎户座天体发射的，那么我们预计存在能量< 25 MeV n"1的强大亚相对论宇宙射线源以及3至7 MeV范围内的7射线。它们的光度分别为Ln ~ 4 • 1043n s"1和L7 ~ 1041ph s~\。
We analyze the origin of the Orion 7-rays discovered by the COMPTEL telescope and possibilities to search Orion-like sources with X-ray telescopes. We have shown that if these 7-rays are produced by a flux of carbon and oxygen subrelativistic nuclei (as it is usually assumed) then we expect a flux of continuous and line X-ray emission. We showed that in addition to the bremsstrahlung and inverse bremsstrahlung radiation a significant part of the continuous X-ray flux is generated by radiative capture of background electrons. The calculations showed also that the 6.4 keV iron line is the most prominent in the Orion X-ray spectrum, if the nuclei fill the whole volume of the Orion complex. The line flux is estimated by Lx ~ 4 • 10 40ph s"1. Since the region of the emission is expected to be extended (the total area is about 100 square degrees) the intensity of the line near Earth is 4.6 • 10~ 3ph cm"2s~1sr~1. This value is below the 3<x level of the ASCA telescope. Therefore, a search of distant (point-like) Orion-like candidates with X-ray telescopes seems to be more perspective. As an example, we analyze the flux of the 6.4 keV iron line observed with ASCA in the direction of the galactic center. If this line is emitted by an Orion-like object in the center of the Galaxy then we expect that there is a powerful source of subrelativistic cosmic rays with energies < 25 MeV n"1 as well as 7-rays in the range 3 to 7 MeV. Their luminosities are Ln ~ 4 • 1043n s"1 and L7 ~ 1041ph s~\ respectively.