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arXiv 1902.00828astro-ph.HE
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Be X射线双星GRO J1008-57可能的费米探测:中子星X射线双星中产生gamma-ray的线索

The likely Fermi detection of the Be X-ray binary GRO J1008-57: hint for gamma-ray production in neutron-star X-ray binaries

Yi Xing, Zhongxiang Wang

摘要:

在我们的搜索从Be X射线双星的伽马射线发射的数据分析与费米伽马射线太空望远镜上的大面积望远镜(LAT),我们发现可能检测GRO J1008-57。该双星的轨道周期为249.48天,只有在轨道相位0.8- 0.9(>4 sigma)时才能被发现。进一步的光变曲线分析表明,这一发现可能主要是由于在2012- 2013年前后的一个轨道周期中,在该源发生巨大的X射线爆发之后发生的发射事件。这种偶尔有伽马射线发射事件的性质与另一颗高质量X射线双星4U 1036-56中所见的相似。然而,考虑到可能从吸积中子星发射伽马射线的模型很难解释观测到的10^{34}尔格·秒^{-1}的源光度,除非距离被大大高估。为了更清楚地确定GRO J1008-57或类似的高质量X射线双星的高能发射特性,并找到理解伽马射线发射如何产生的线索,还需要进一步的观测研究。

英文摘要:

In our search for gamma-ray emission from Be X-ray binaries from analysis of the data obtained with the Large Area Telescope (LAT) on board the Fermi Gamma-Ray Space Telescope, we find likely detection of GRO J1008-57. The binary has an orbital period of 249.48 days, and it is only significantly detected in its orbital phase 0.8--0.9 (>4 sigma). Further light curve analysis indicates that the detection is probably largely due to an emitting event in one orbital cycle around year 2012--2013, following a giant X-ray outburst of the source. This property of having occasional gamma-ray emitting events is similar to that seen in another high-mass X-ray binary 4U 1036-56. However, models considering possible gamma-ray emission from an accreting neutron star have difficulty in explaining the observed 10^{34} erg s^{-1} luminosity of the source, unless the distance was largely over-estimated. Further observational studies are required, in order to more clearly establish the high-energy emission properties of GRO J1008-57 or similar high-mass X-ray binaries and find clues for understanding how gamma-ray emission is produced from them.

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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