X-RAY AND GAMMA-RAY EMISSIONS FROM ROTATION POWERED MILLISECOND PULSARS
X-RAY AND GAMMA-RAY EMISSIONS FROM ROTATION POWERED MILLISECOND PULSARS
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DOI：
10.1088/0004-637x/745/1/100
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发表时间：
2011-11
期刊：
影响因子：
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通讯作者：
J. Takata;K. Cheng;R. Taam
中科院分区：
文献类型：
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作者：
J. Takata;K. Cheng;R. Taam
费米大面积望远镜已经揭示了旋转驱动的毫秒双星（MSP）是银河系γ射线源群的主要贡献者。这类双星在模拟几个低质量X射线双星（LMXB）的静止状态时可能也很重要，其中对伴星星星的光学观测表明可能存在旋转动力的MSP。为了了解不同演化阶段的MSPs的观测特性，我们研究了与外隙模型相关的X射线和γ射线辐射。对于旋转供电的MSP，外间隙的大小和高能发射的性质由表面附近的光子-光子对产生过程或磁对产生过程控制。对于这些类星体，我们发现由磁对产生过程控制的外能隙模型在解释γ射线光度或非热X射线光度与自旋下降功率之间可能的相关性方面是较好的。对于静态LMXB中的吸积MSP，深部地壳加热导致的中子星星（NS）表面的热X射线发射可以控制外隙的条件。我们认为，在几个LMXB的静态观察到的光学调制起源于施主星星的γ射线从外部间隙的照射。在这些系统中，对于高质量的NS，可以实现光源（例如SAX J1808.4 - 3658）的光学调制所需的照射光度。最后，我们讨论了黑寡妇系统中与二元内冲击相关的高能发射，例如，PSR B1957+20。
The Fermi Large Area Telescope has revealed that rotation powered millisecond pulsars (MSPs) are a major contributor to the Galactic γ-ray source population. Such pulsars may also be important in modeling the quiescent state of several low-mass X-ray binaries (LMXBs), where optical observations of the companion star suggest the possible existence of rotation powered MSPs. To understand the observational properties of the different evolutionary stages of MSPs, the X-ray and γ-ray emissions associated with the outer gap model are investigated. For rotation powered MSPs, the size of the outer gap and the properties of the high-energy emission are controlled by either the photon–photon pair-creation process or magnetic pair-creation process near the surface. For these pulsars, we find that the outer gap model controlled by the magnetic pair-creation process is preferable in explaining the possible correlations between the γ-ray luminosity or non-thermal X-ray luminosity versus the spin-down power. For the accreting MSPs in quiescent LMXBs, the thermal X-ray emission at the neutron star (NS) surface resulting from deep crustal heating can control the conditions in the outer gap. We argue that the optical modulation observed in the quiescent state of several LMXBs originates from the irradiation of the donor star by γ-rays from the outer gap. In these systems, the irradiation luminosity required for the optical modulation of the source such as SAX J1808.4−3658 can be achieved for a NS of high mass. Finally, we discuss the high-energy emission associated with an intra-binary shock in black widow systems, e.g., PSR B1957+20.