文章基本信息

标题：Identifying the 3FHL Catalog. II. Results of the KOSMOS Optical Spectroscopy Campaign
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作者：S. Marchesi ; A. Kaur ; M. Ajello 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2018
卷号：156
期号：5
页码：1-11
DOI：10.3847/1538-3881/aae201
语种：English
出版社：American Institute of Physics
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.
关键词：BL Lacertae objects: general;galaxies: distances and redshifts;galaxies: nuclei