论文标题
使用Swift和Sara数据揭示高Z Fermi-lat Bl lacs，并通过光度分析
Revealing high-z Fermi-LAT BL Lacs using Swift and SARA data with photometric analysis
论文作者
论文摘要
Bl lacertae（Bl lac）对象是Blazar的一个子类，其特征光谱与众不同。无特征的光谱在测量BL Lacs的红移方面提出了一个挑战。在本文中，我们使用光度液化技术测量BL LAC的红移。基于空间的望远镜\ emph {Swift}和基于地面的Sara望远镜用于在$ uvw2，\ uvm2，\ uvw1，\ u，\ u，\ u，\ b，\ v，\ v，\ g'，\ g'，\ g'，\ r'，\ r'，\ i'，\ i'，\ z'$ fileters中提供大小。我们观察到60个BL LAC，并为其中41个报告可靠的红移上限。 We discover three new high-$z$ BL Lacs ($z>1.3$) at $1.74_{-0.08}^{+0.05}$, $1.88_{-0.03}^{+0.07}$, and $2.10_{-0.04}^{+0.03}$, bringing the number of high-$z$ BL Lacs found by this method up to 19.讨论是根据对Blazar序列，\ Emph {Fermi} Blazar Divide和Gamma-ray Horizon的含义进行的讨论。
BL Lacertae (BL Lac) objects are a subclass of blazar, distinguished by their featureless optical spectrum. The featureless spectrum presents a challenge in measuring the redshift of the BL Lacs. In this paper, we measure the redshift of BL Lacs using the photometric dropout technique. The space-based telescope \emph{Swift} and the ground-based SARA telescopes are employed to provide magnitudes in the $uvw2,\ uvm2,\ uvw1,\ u,\ b,\ v,\ g',\ r',\ i',\ z'$ filters. We observe 60 BL Lacs and report reliable redshift upper limits for 41 of them. We discover three new high-$z$ BL Lacs ($z>1.3$) at $1.74_{-0.08}^{+0.05}$, $1.88_{-0.03}^{+0.07}$, and $2.10_{-0.04}^{+0.03}$, bringing the number of high-$z$ BL Lacs found by this method up to 19. Discussions are made on the implications for the blazar sequence, the \emph{Fermi} blazar divide, and the gamma-ray horizon based on an analysis of the 4LAC catalog and all high-$z$ BL Lacs found with the photo-$z$ technique.
