γ射线双星 1FGL J1018.6-5856 的周期辐射。

Periodic emission from the gamma-ray binary 1FGL J1018.6-5856.

机构信息

W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA.

出版信息

Science. 2012 Jan 13;335(6065):189-93. doi: 10.1126/science.1213974.

DOI:10.1126/science.1213974

PMID:22246769

Abstract

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.

摘要

伽马射线双星是包含一颗中子星或黑洞的恒星系统，伽马射线发射是由两个组成部分之间的相互作用产生的。尽管双星演化模型预测在我们的银河系中有数十个这样的系统，但实际上伽马射线双星非常罕见。费米大面积望远镜（LAT）对伽马射线双星的搜索表明，1FGL J1018.6-5856 表现出强度和光谱调制，其周期为 16.6 天。我们发现了一个可变的 X 射线对应体，它显示出与伽马射线发射最大值相吻合的尖锐最大值，以及一个 O6V((f)) 型星光学对应体和一个无线电对应体，也明显在轨道周期上调制。因此，1FGL J1018.6-5856 是一个伽马射线双星，它的探测表明银河系中还存在其他较暗的双星。