论文标题
使用Swift和Sara狩猎遥远的BL LACS使用光度法技术
Hunting distant BL Lacs with the photometric technique using Swift and SARA
论文作者
论文摘要
Bl lacertae对象（BL LACS）代表第三费米大面积望远镜目录（3FGL）中的γ射线源的大部分（22 \％）。由于其毫无功能的光谱，将近一半的BL LAC人口没有红移。我们旨在通过使用光度法技术通过红移测量来增加BL LAC的数量。在这项工作中，我们使用了6个Swift-Uvot过滤器和SDSS G，R，I，Z光学过滤器，该滤镜安装在智利的0.65 m Sara-Ctio上，并在金丝雀群岛的1.0 M Sara-orm。从3FGL目录中选择了45个源的样品，该目录在10个光学和紫外线过滤器中进行了光度法以获得红移测量。我们发现了3个具有Z> 1.3的来源，同时为17个来源得出了可靠的上限。此处介绍的结果将高Z（Z> 1.3）BL LAC的总数提高到29。
BL Lacertae objects (BL Lacs) represent a large fraction (22\%) of gamma-ray sources in the Third Fermi Large Area Telescope catalog (3FGL). Nearly half of the BL Lac population remains without a redshift because of their featureless optical spectra. We aim to increase the number of BL Lacs with a redshift measurement by using the photometric technique. For this work, we have used 6 Swift-UVOT filters and SDSS g,r,i,z optical filters mounted on the 0.65 m SARA-CTIO located in Chile and the 1.0 m SARA-ORM in Canary Islands. A sample of 45 sources was selected from the 3FGL catalog for which photometry was performed in 10 optical and UV filters to obtain redshift measurements. We found 3 sources with z>1.3 while reliable upper limits have been derived for 17 sources. The results presented here bring the total number of high-z (z>1.3) BL Lacs to 29.
