2FHL: THE SECOND CATALOG OF HARD FERMI-LAT SOURCES
2FHL: THE SECOND CATALOG OF HARD FERMI-LAT SOURCES
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DOI：
10.3847/0067-0049/222/1/5
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发表时间：
2015-08
期刊：
影响因子：
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通讯作者：
M. Ackermann;M. Ajello;W. Atwood;L. Baldini;L. Baldini;J. Ballet;G. Barbiellini;G. Barbiellini-G.-Barbiellin
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文献类型：
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作者：
M. Ackermann;M. Ajello;W. Atwood;L. Baldini;L. Baldini;J. Ballet;G. Barbiellini;G. Barbiellini-G.-Barbiellin
我们提出了一个目录的源检测到的费米大面积望远镜（LAT）在80个月的数据超过50 GeV。新交付的Pass 8事件级分析可以检测和表征50 GeV-2 TeV能量范围内的源。在这个能带中，Fermi-LAT探测到了360个源，构成了第二个硬Fermi-LAT源目录（2FHL）。角分辨率的提高使点源（68%C时半径为1.7）的精确定位成为可能。L.）的范围内。以及空间扩展源的检测和表征。我们发现，86%的源可以与其他波长的对应物相关联，其中大多数（75%）是活动星系核，其余（11%）是银河系源。只有25%的2FHL源以前曾被切伦科夫望远镜探测到，这意味着2FHL提供了一个候选者的水库，以跟进在非常高的能量。这项工作缩小了费米-LAT在轨道上以GeV能量进行的观测与切伦科夫望远镜在地面以更高能量进行的观测之间的能量差距。
We present a catalog of sources detected above 50 GeV by the Fermi-Large Area Telescope (LAT) in 80 months of data. The newly delivered Pass 8 event-level analysis allows the detection and characterization of sources in the 50 GeV–2 TeV energy range. In this energy band, Fermi-LAT has detected 360 sources, which constitute the second catalog of hard Fermi-LAT sources (2FHL). The improved angular resolution enables the precise localization of point sources (∼1.′7 radius at 68% C. L.) and the detection and characterization of spatially extended sources. We find that 86% of the sources can be associated with counterparts at other wavelengths, of which the majority (75%) are active galactic nuclei and the rest (11%) are Galactic sources. Only 25% of the 2FHL sources have been previously detected by Cherenkov telescopes, implying that the 2FHL provides a reservoir of candidates to be followed up at very high energies. This work closes the energy gap between the observations performed at GeV energies by Fermi-LAT on orbit and the observations performed at higher energies by Cherenkov telescopes from the ground.