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arXiv 1702.00664astro-ph.HE
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3FHL:第三个硬费米LAT源目录

3FHL: The Third Catalog of Hard Fermi-LAT Sources

LAT Collaboration

摘要:

我们提出了一个目录的源检测到10 GeV以上的费米大面积望远镜(LAT)在第一个7年的数据使用通行证8事件级分析。这是第三个硬费米-LAT源目录(3FHL),包含1556个在10 GeV - 2 TeV能量范围内的天体。灵敏度和角分辨率相对于相同能量(1FHL)的先前LAT目录提高了3倍和2倍。绝大多数探测到的源(79%)与河外其他波长的对应源有关,包括16个位于极高红移($z>2$)的源。8%的来源有银河系的对应物,13%是无关的(或与未知性质的来源有关)。观测高纬度天空和银道面的通量灵敏度分别为4.4至9.5 $\times 10^{-11}$ ph cm $^{-2}$ s $^{-1}$(这大约是蟹状星云10 GeV以上通量的0.5%和1%)。该目录包括214个新的$γ$射线源。光子数量的大幅增加(相对于1FHL超过4倍,相对于2FHL超过10倍)也使我们能够测量32个源的显着光谱曲率,并发现其中163个源的通量变化。此外,我们估计,对于相同的流量限制的$10^{-12}$ erg cm $^{-2}$ s $^{-1}$,能量范围超过10 GeV的两倍以上的50 GeV的来源,突出的重要性,为未来切伦科夫望远镜,尽可能降低能量阈值。

英文摘要:

We present a catalog of sources detected above 10 GeV by the Fermi Large Area Telescope (LAT) in the first 7 years of data using the Pass 8 event-level analysis. This is the Third Catalog of Hard Fermi-LAT Sources (3FHL), containing 1556 objects characterized in the 10 GeV - 2 TeV energy range. The sensitivity and angular resolution are improved by factors of 3 and 2 relative to the previous LAT catalog at the same energies (1FHL). The vast majority of detected sources (79%) are associated with extragalactic counterparts at other wavelengths, including 16 sources located at very high redshift ($z>2$). Eight percent of the sources have Galactic counterparts and 13% are unassociated (or associated with a source of unknown nature). The high-latitude sky and the Galactic plane are observed with a flux sensitivity of 4.4 to 9.5$\times 10^{-11}$ ph cm$^{-2}$ s$^{-1}$, respectively (this is approximately 0.5% and 1% of the Crab Nebula flux above 10 GeV). The catalog includes 214 new $γ$-ray sources. The substantial increase in the number of photons (more than 4 times relative to 1FHL and 10 times to 2FHL) also allows us to measure significant spectral curvature for 32 sources and find flux variability for 163 of them. Furthermore, we estimate that for the same flux limit of $10^{-12}$ erg cm$^{-2}$ s$^{-1}$, the energy range above 10 GeV has twice as many sources as above 50 GeV, highlighting the importance, for future Cherenkov telescopes, of lowering the energy threshold as much as possible.

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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