Discovery of the Galactic High-mass Gamma-Ray Binary 4FGL J1405.1−6119
Discovery of the Galactic High-mass Gamma-Ray Binary 4FGL J1405.1−6119
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DOI：
10.3847/1538-4357/ab3e32
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发表时间：
2019-08
期刊：
影响因子：
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通讯作者：
R. Corbet;R. Corbet;L. Chomiuk;M. Coe;J. Coley;J. Coley;G. Dubus;P. G. Edwards;P. Martin
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文献类型：
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作者：
R. Corbet;R. Corbet;L. Chomiuk;M. Coe;J. Coley;J. Coley;G. Dubus;P. G. Edwards;P. Martin
我们报告了费米大天区望远镜（LAT）源4FGL J1405.1−6119（=3FGL J1405.4−6119）的多波长观测结果，它是一个高质量的伽马射线双星。LAT的观测结果显示，该系统的伽马射线发射以13.7135 ± 0.0019天的周期调制，每个轨道有两个具有不同光谱特性的极大值。使用尼尔·盖尔斯·斯威夫特天文台X射线望远镜进行的X射线观测表明，X射线发射在这一时期也受到调制，但只有一个最大值，更接近次级低能伽马射线最大值。在澳大利亚望远镜紧凑阵列的观测中也发现了一个与X射线源一致的射电源，并且射电源的发射被调制在伽马射线周期上，相位与X射线发射相似。大范围的星际遮蔽严重阻碍了光学观测，但发现了一个近红外对应物。近红外光谱表明O6 III光谱分类。这是第三个用费米LAT发现的伽马射线双星，来自周期性调制的伽马射线发射，其他两个源也有早期O星星，而不是Be星星，对应物。我们考虑在什么样的距离，我们可以检测到这种调制的伽马射线发射的LAT，并检查银河系的伽马射线二进制人口的约束。
We report the identification from multiwavelength observations of the Fermi Large Area Telescope (LAT) source 4FGL J1405.1−6119 (=3FGL J1405.4−6119) as a high-mass gamma-ray binary. Observations with the LAT show that gamma-ray emission from the system is modulated at a period of 13.7135 ± 0.0019 days, with the presence of two maxima per orbit with different spectral properties. X-ray observations using the Neil Gehrels Swift Observatory X-ray Telescope show that X-ray emission is also modulated at this period, but with a single maximum that is closer to the secondary lower-energy gamma-ray maximum. A radio source, coincident with the X-ray source is also found from Australia Telescope Compact Array observations, and the radio emission is modulated on the gamma-ray period with similar phasing to the X-ray emission. A large degree of interstellar obscuration severely hampers optical observations, but a near-infrared counterpart is found. Near-infrared spectroscopy indicates an O6 III spectral classification. This is the third gamma-ray binary to be discovered with the Fermi-LAT from periodic modulation of the gamma-ray emission, the other two sources also have early O star, rather than Be star, counterparts. We consider at what distances we can detect such modulated gamma-ray emission with the LAT, and examine constraints on the gamma-ray binary population of the Milky Way.