Discovery of annular X-ray emission centered on MAXI?J1421-613: Dust-scattering X-rays?
Discovery of annular X-ray emission centered on MAXI?J1421-613: Dust-scattering X-rays?
复制标题
以 MAXI?J1421-613 为中心的环形 X 射线发射的发现：尘埃散射 X 射线？
DOI：
10.1093/pasj/psaa007
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发表时间：
2020
影响因子：
2.3
通讯作者：
Yamauchi Shigeo
中科院分区：
文献类型：
--
作者：
Nobukawa Kumiko K;Nobukawa Masayoshi;Yamauchi Shigeo
在朱雀星的后续分析中，我们发现了一个围绕瞬态源中心的环形辐射，该瞬态源是X射线爆发器MAXI J1421-613。环形发射的光谱显示没有显着的发射线结构，并很好地解释了吸收的幂律模型与光子指数。这些特征排除了环形辐射是超新星遗迹的壳状成分的可能性。的光谱形状，时间的历史，和环形发射的X射线通量同意的情况下，发射是由于尘埃散射回波。环形发射是在罕见的尘埃散射回波条件下进行的，其中中心X射线源MAXI J1421-613表现出具有三个X射线爆发的短时间爆发，并立即重新进入长时间的静止期。氢柱密度沿着环状辐射的分布与CO强度的分布一致，说明MAXI J1421-613位于CO云的后面。我们估计的距离MAXI J1421-613 bekpc假设的尘埃层负责的环状排放位于同一位置的CO云。
We report the discovery of an annular emission ofradius around the center of a transient source, the X-ray burster MAXI J1421-613, in the Suzaku follow-up analysis. The spectrum of the annular emission shows no significant emission-line structure, and is well explained by an absorbed power-law model with a photon index of. These features exclude the possibility that the annular emission is a shell-like component of a supernova remnant. The spectral shape, the time history, and the X-ray flux of the annular emission agree with the scenario that the emission is due to a dust-scattering echo. The annular emission is made under a rare condition of the dust-scattering echo, where the central X-ray source, MAXI J1421-613, exhibits a short time outburst with three X-ray bursts and immediately re-enters a long quiescent period. The distribution of the hydrogen column density along the annular emission follows that of the CO intensity, which means that MAXI J1421-613 is located behind the CO cloud. We estimate the distance to MAXI J1421-613 to bekpc assuming that the dust layer responsible for the annular emission is located at the same position as the CO cloud.