THE THIRD CATALOG OF ACTIVE GALACTIC NUCLEI DETECTED BY THE FERMI LARGE AREA TELESCOPE
THE THIRD CATALOG OF ACTIVE GALACTIC NUCLEI DETECTED BY THE FERMI LARGE AREA TELESCOPE
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DOI：
10.1088/0004-637x/810/1/14
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发表时间：
2015-09-01
影响因子：
4.9
通讯作者：
Zimmer, S.
中科院分区：
文献类型：
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作者：
Ackermann, M.;Ajello, M.;Zimmer, S.
介绍了Fermi-LAT （3LAC）探测到的第三个活动星系核（agn）目录。它是基于2008年8月4日至2012年7月31日期间在100 MeV至300 GeV之间检测到的第三个费米- lat目录（3FGL），测试统计量大于25。3LAC包括1591个agn，位于银河系高纬度（垂线b垂线bbb10度），根据2年的数据，比第二目录增加了71%。有28个重复的关联，因此3FGL星表的2192个高纬度伽玛射线源中有1563个是agn。其中大部分（98%）是耀变体。新发现的耀变体中大约有一半是未知类型的，也就是说，它们缺乏足够质量的光谱信息来确定其发射线的强度。根据它们的伽玛射线光谱特性，这些源被均匀地分为平谱射电类星体（FSRQs）和BL类星体。检测到的最丰富的BL lac是高同步峰（HSP）型。大约50%的BL lac没有测量到红移。报道了一些新的罕见异常值（HSP- fsrq和高亮度HSP BL lac）。3LAC样品的一般性质证实了以前在早期目录中的发现。即使在BZCAT-blazar射电、光学和x射线通量分布的微弱端，3LAC blazar在BZCAT列出的blazar总数中的比例仍然不可忽略，这表明即使是已知最微弱的blazar最终也可能在lata探测水平上发出伽马射线。不同耀变体群的能量通量分布与早期星表的推断非常吻合。
The third catalog of active galactic nuclei (AGNs) detected by the Fermi-LAT (3LAC) is presented. It is based on the third Fermi-LAT catalog (3FGL) of sources detected between 100 MeV and 300 GeV with a Test Statistic greater than 25, between 2008 August 4 and 2012 July 31. The 3LAC includes 1591 AGNs located at high Galactic latitudes (vertical bar b vertical bar > 10 degrees), a 71% increase over the second catalog based on 2 years of data. There are 28 duplicate associations, thus 1563 of the 2192 high-latitude gamma-ray sources of the 3FGL catalog are AGNs. Most of them (98%) are blazars. About half of the newly detected blazars are of unknown type, i.e., they lack spectroscopic information of sufficient quality to determine the strength of their emission lines. Based on their gamma-ray spectral properties, these sources are evenly split between flat-spectrum radio quasars (FSRQs) and BL Lacs. The most abundant detected BL Lacs are of the high-synchrotron-peaked (HSP) type. About 50% of the BL Lacs have no measured redshifts. A few new rare outliers (HSP-FSRQs and high-luminosity HSP BL Lacs) are reported. The general properties of the 3LAC sample confirm previous findings from earlier catalogs. The fraction of 3LAC blazars in the total population of blazars listed in BZCAT remains non-negligible even at the faint ends of the BZCAT-blazar radio, optical, and X-ray flux distributions, which hints that even the faintest known blazars could eventually shine in gamma-rays at LAT-detection levels. The energy-flux distributions of the different blazar populations are in good agreement with extrapolation from earlier catalogs.