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arXiv 1301.5940astro-ph.HE
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PSR J1648-4611与朱雀星邻近地区弥散硬X射线辐射的发现

Discovery of Diffuse Hard X-Ray Emission from the Vicinity of PSR J1648-4611 with Suzaku

Michito Sakai, Hironori Matsumoto, Yoshito Haba, Yasufumi Kanou, Youhei Miyamoto

摘要:

我们用朱雀号观测了脉冲星PSR J1648-4611。在视场中发现两个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。我们利用同一区域的Chandra图像在Src A附近发现了点源,但点源具有软X射线发射,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 \times 10^{-13} erg cm^{-2} s^{-1}。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,其X射线谱可用幂律模型描述,光子指数为3.0^{+1.4}-{0.8}。在0.4-10 keV波段的X射线通量为6.4 \times 10^{-14} erg s^{-1} cm^{-2}。在文献中没有发现Src B的对应物。

英文摘要:

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 \times 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 \times 10^{-14} erg s^{-1} cm^{-2}. No counterpart for Src B is found in literatures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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