DISCOVERY OF GAMMA-RAY ORBITAL MODULATION IN THE BLACK WIDOW PSR J1311–3430
DISCOVERY OF GAMMA-RAY ORBITAL MODULATION IN THE BLACK WIDOW PSR J1311–3430
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DOI：
10.1088/2041-8205/804/2/l33
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发表时间：
2015-02
期刊：
影响因子：
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通讯作者：
Y. Xing;Zhongxiang Wang
中科院分区：
文献类型：
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作者：
Y. Xing;Zhongxiang Wang
我们报告了我们从黑寡妇系统PSR J1311−3430中发现的轨道调制γ射线发射。我们分析了费米大天区望远镜在脉冲星的非脉冲相位间隔期间的数据，发现了轨道调制信号在<$3 σ的置信水平。进一步的光谱分析表明，在明亮和暗淡的轨道相位范围内获得的光谱没有显着差异。一个简单的类正弦函数可以描述调制。基于这些性质，我们认为双星内部的γ射线发射来自于靠近伴星的区域，这种调制是由伴星对发射区域的遮蔽引起的，类似于过渡毫秒脉冲星双星PSR J1023+0038中的现象。考虑到最近报道的蚀型MSP双星的星内激波辐射的X射线探测，这一发现进一步表明它们的星内γ射线辐射的普遍存在。
We report our discovery of orbitally modulated γ-ray emission from the black widow system PSR J1311−3430. We analyze the Fermi Large Area Telescope data during the off-pulse phase interval of the pulsar and find the orbital modulation signal at a ∼3σ confidence level. Further spectral analysis shows no significant differences for the spectra obtained during the bright and faint orbital phase ranges. A simple sinusoid-like function can describe the modulation. Given these properties, we suggest that the intrabinary γ-ray emission arises from the region close to the companion and the modulation is caused by the occultation of the emitting region by the companion, similar to that is seen in the transitional millisecond pulsar binary (MSP) PSR J1023+0038. Considering the X-ray detection of intrabinary shock emission from eclipsing MSP binaries recently reported, this discovery further suggests the general existence of intrabinary γ-ray emission from them.