X-ray hot spots in the eastern ear of the supernova remnant W 50 and the microquasar SS 433 system
X-ray hot spots in the eastern ear of the supernova remnant W 50 and the microquasar SS 433 system
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超新星遗迹 W 50 和微类星体 SS 433 系统东耳的 X 射线热点
DOI：
10.1093/pasj/psac011
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发表时间：
2022
影响因子：
2.3
通讯作者：
Axelsson Magnus
中科院分区：
文献类型：
--
作者：
Hayakawa Ryota;Yamada Shinya;Suda Hirotaka;Ichinohe Yuto;Higurashi Ryota;Sakemi Haruka;Machida Mami;Ohmura Takumi;Katsuda Satoru;Uchiyama Hideki;Sato Toshiki;Akamatsu Hiroki;Axelsson Magnus
我们检查了W-50/SS-433系统东耳的X射线和射电空间结构，以澄清SS-433急流终止区的一个特征，发现丝状结构前面的一个热点，被认为是SS-433东急流的终端激波，与单点震源明显不同。钱德拉的观测很好地解析了X射线发射的详细空间结构，表明有两个来源。通过将钱德拉的点扩展函数与两个震源的径向剖面相比较，北部的震源明显比点震源扩展得更广，而另一个震源似乎略有扩展。由于附近没有点源，北部热点很可能是局部漫射源。北方热点在空间上对应于射电发射的峰值。它的空间相关性得到了XMM-牛顿X射线图像的证实。这两个源的X射线谱都是按单一吸收的幂定律再现的，但北部的列密度是∼的3倍。当包含同步辐射和逆康普顿辐射的辐射模型应用于北部热点的光谱能量分布时，该热点的辐射可以用在磁场强度为B≲50 μG时加速到30 TeV的电子布居的辐射来解释。该模型也与射电和X射线数据以及费米卫星获得的伽马射线辐射上限相一致。
We examined the X-ray and radio spatial structure at the eastern ear of the W 50/SS 433 system to clarify a characteristic feature of the termination region of the SS 433 jet, and found that a hot spot ahead of the filament structure, which is considered to be a terminal shock of the SS 433 eastern jet, is clearly different from a single point source. The detailed spatial structure of the X-ray emission is finely resolved by Chandra observations, showing that there are two sources. By comparing the point-spread function of Chandra with the radial profiles of the two sources, the northern one is clearly more extended than a point source while the other seems marginally extended. Since there are no point sources nearby, the northern hot spot is likely a localized diffuse source. The northern hot spot spatially corresponds to the peak of the radio emission. Its spatial correlation is confirmed by an X-ray image using XMM-Newton. The X-ray spectra of the two sources are reproduced by a single absorbed power-law but the column density of the northern part is larger by a factor of ∼3. When a radiation model comprising synchrotron emission and inverse Compton emission is applied to the spectral energy distribution of the northern hot spot, the emission from this spot can be explained by the radiation from an electron population accelerated up to 30 TeV in a magnetic field strength ofB≲ 50 μG. This model also agrees with the radio and X-ray data, as well as the upper limit of gamma-ray emission obtained by the Fermi satellite.