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首页> 外文期刊>The Astrophysical Journal. Supplement Series >Identifying the 3FHL Catalog. III. Results of the CTIO-COSMOS Optical Spectroscopy Campaign
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Identifying the 3FHL Catalog. III. Results of the CTIO-COSMOS Optical Spectroscopy Campaign

机译：识别3FHL目录。 III。 CTIO-COSMOS光谱运动的结果

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摘要

Active galactic nuclei (AGNs) with their relativistic jets pointed toward the observer form a subclass of luminous gamma-ray sources commonly known as blazars. The study of blazars is essential to improve our understanding of the AGNs emission mechanisms and evolution, as well as to map the extragalactic background light. To do so, however, one needs to classify and measure a redshift for a large sample of these sources correctly. The Third Fermi-LAT Catalog of High-Energy Sources (3FHL) contains approximate to 1160 blazars reported at energies greater than 10 GeV. However, similar to 25% of these sources are unclassified and similar to 50% lack redshift information. To increase the spectral completeness of the 3FHL catalog, we are working on an optical spectroscopic follow-up campaign using 4 m and 8 m telescopes. In this paper, we present the results of the second part of this campaign, where we observed 23 blazars using the 4 m telescope at Cerro Tololo Interamerican Observatory in Chile. We report that all the 23 sources are classified as BL Lacs, a confirmed redshift measurement for three sources, a redshift lower limit for two sources, and a tentative redshift measurement for three sources.
机译：活性银核（AGNS）与其相对论射流指向观察者，形成通常称为Blazars的发光伽马射源的亚类。 Blazars的研究对于改善对AGNS排放机制和演化的理解至关重要，以及映射刷新背景光。然而，要这样做，需要正确分类和测量用于正确样本的红移。高能源（3FHL）的第三个Fermi-Lat目录含有近似于1160的Blazars在大于10 GEV的能量上报告。然而，类似于25％的这些来源未分类并且类似于50％缺少红移信息。为了提高3FHL目录的频谱完整性，我们正在使用4米和8米望远镜的光学光谱跟进运动。在本文中，我们展示了这项运动的第二部分的结果，在那里我们在智利塞罗托利奥尔罗戈·奥泰山脉观测站中观察了23个布拉格。我们报告说，所有23个源都被归类为BL LAC，一个确认的三种来源的红移测量，两个来源的红移下限，以及三种来源的暂定红移测量。

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