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arXiv 1202.3164astro-ph.HE
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Gamma-ray二进制1 FGL J1018的周期发射.6-5856

Periodic Emission from the Gamma-ray Binary 1FGL J1018.6-5856

The Fermi LAT Collaboration, M. J. Coe, F. Di Mille, P. G. Edwards, M. D. Filipović, J. L. Payne, J. Stevens, M. A. P. Torres

摘要:

伽马射线双星是包含一颗中子星或黑洞的恒星系统,它们之间的相互作用产生伽马射线辐射。这些系统是罕见的,即使二元演化模型预测在我们的银河系中有几十个。费米大天区望远镜(LAT)对伽马射线双星的搜索显示,1FGL J1018.6-5856具有16.6天周期的强度和光谱调制。我们确定了一个可变的X射线对应物,它显示了一个尖锐的最大值与最大伽马射线发射相吻合,以及一个O 6V((f))恒星光学对应物和一个无线电对应物,也显然是调制的轨道周期。1FGL J1018.6-5856因此是一颗伽马射线双星,它的发现表明银河系中存在其他更暗的双星。

英文摘要:

Gamma-ray binaries are stellar systems containing a neutron star or black hole with gamma-ray emission produced by an interaction between the components. These systems are rare, even though binary evolution models predict dozens in our Galaxy. A search for gamma-ray binaries with the Fermi Large Area Telescope (LAT) shows that 1FGL J1018.6-5856 exhibits intensity and spectral modulation with a 16.6 day period. We identified a variable X-ray counterpart, which shows a sharp maximum coinciding with maximum gamma-ray emission, as well as an O6V((f)) star optical counterpart and a radio counterpart that is also apparently modulated on the orbital period. 1FGL J1018.6-5856 is thus a gamma-ray binary, and its detection suggests the presence of other fainter binaries in the Galaxy.

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