arXiv 1809.054862018-09-14astro-ph.GAastro-ph.HE

确定3FHL目录：I. KOSMOS光谱活动的结果

Identifying the 3FHL catalog: I. Results of the KOSMOS optical spectroscopy campaign

Stefano Marchesi, Amanpreet Kaur, Marco Ajello

备注：: 12 pages, 6 figures. Accepted for publication on the Astronomical Journal Supplement Series. The spectra analyzed in this work are available at the following link: https://clemson.app.box.com/s/uu1hk6g4qy0ow9j4nst4nifm3mmrs19f
DOI：: 10.3847/1538-3881/aae201

摘要：

本文介绍了第三代费米-LAT高能源目录（3FHL）中28颗未分类耀变体的光谱跟踪结果。所有的光谱都是用基特峰的4米马约尔望远镜拍摄的。通过这个后续计划，我们能够将28个物体中的27个分类为BL Lac，而剩下的一个是平谱射电类星体。我们确定了其中三个天体的红移（z），并确定了其他四个源的z下限：我们获得红移的最远天体的z>0.836。这些结果是3FHL耀变体光学光谱后续活动的一部分，旨在获得>10 GeV的完整耀变体样本，然后将用于扩展我们对耀变体发射机制和河外背景光的了解。

英文摘要：

We present the results of the optical spectroscopy follow-up of a sample of 28 unclassified blazars from the Third Fermi-LAT Catalog of High-Energy Sources (3FHL). All the spectra were taken with the 4m Mayall telescope at Kitt Peak. With this follow-up program we are able to classify 27 out of 28 objects as BL Lacs, while the remaining one is a flat spectrum radio quasar. We determine a redshift (z) for three of these objects and a lower limit on z for other four sources: the farthest object for which we obtain a redshift has z>0.836. These results are part of a more extended campaign of optical spectroscopy follow-up of 3FHL blazars, aimed to obtain a complete sample of blazars at >10 GeV which will then be used to extend our knowledge on blazar emission mechanisms and on the extragalactic background light.

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