Discovery of Diffuse Hard X-Ray Emission from the Vicinity of PSR J1648−4611 with Suzaku
Discovery of Diffuse Hard X-Ray Emission from the Vicinity of PSR J1648−4611 with Suzaku
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用朱雀发现 PSR J1648−4611 附近的漫射硬 X 射线发射
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Youhei Miyamoto
中科院分区：
文献类型：
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作者：
M. Sakai;H. Matsumoto;Y. Haba;Yasufumi Kanou;Youhei Miyamoto
我们用朱雀号观测了脉冲星PSR J1648-4611。在视场中发现了两个X射线源，朱雀J1648-4610（Src A）和朱雀J1648-4615（Src B）。Src A与脉冲星PSR J1648-4611重合，后者也被费米伽马射线太空望远镜探测到。硬带图像表明Src A在空间上延伸。我们通过使用同一区域的Chandra图像在Src A附近发现了点源，但是点源具有软X射线发射并且不能解释Src A的硬X射线发射。Src A的硬带光谱可用幂律模型再现，光子指数为2.0^{+0.9}_{-0.7}。2-10 keV波段的X射线通量为1.4 10埃，厘米，秒。弥散发射表明PSR J1648-4611周围有一个脉冲星风星云，但Src A的光度远大于脉冲星自旋向下光度的预期。HESS J1646-458的部分甚高能量伽马射线发射可能是由PSR J1648-4611驱动的脉冲星风星云提供动力的。Src B具有软发射特性，其X射线谱可用幂律模型描述，光子指数为3.0^{+1.4}-{0.8}。0.4-10 keV波段的X射线通量为6.4 埃10^{-14}尔格·秒^{-1}厘米^{-2}。Src B在文献中未见对应物。
We observed the pulsar PSR J1648-4611 with Suzaku. Two X-ray sources, Suzaku J1648-4610 (Src A) and Suzaku J1648-4615 (Src B), were found in the field of view. Src A is coincident with the pulsar PSR J1648-4611, which was also detected by the Fermi Gamma-ray Space Telescope. A hard-band image indicates that Src A is spatially extended. We found point sources in the vicinity of Src A by using a Chandra image of the same region, but the point sources have soft X-ray emission and cannot explain the hard X-ray emission of Src A. The hard-band spectrum of Src A can be reproduced by a power-law model with a photon index of 2.0^{+0.9}_{-0.7}. The X-ray flux in the 2-10 keV band is 1.4 imes 10^{-13} erg cm^{-2} s^{-1}. The diffuse emission suggests a pulsar wind nebula around PSR J1648-4611, but the luminosity of Src A is much larger than that expected from the spin-down luminosity of the pulsar. Parts of the very-high-energy gamma-ray emission of HESS J1646-458 may be powered by this pulsar wind nebula driven by PSR J1648-4611. Src B has soft emission, and its X-ray spectrum can be described by a power-law model with a photon index of 3.0^{+1.4}_{-0.8}. The X-ray flux in the 0.4-10 keV band is 6.4 imes 10^{-14} erg s^{-1} cm^{-2}. No counterpart for Src B is found in literatures.