BL Lac天体的光谱学：TeV候选天体
Optical spectroscopy of BL Lac objects: TeV candidates
摘要：
我们调查的光谱光学性质的伽马射线源检测到的高意义以上的50 GeV的第三目录的硬费米-LAT源（3FHL），是很好的候选人TeV发射器。我们专注于91源，标记的费米团队作为BL Lac对象（BLL）或Blazar候选人的不确定类型（BCU），这是在北半球，是未知的或不确定的红移。本文报道了13 BCU和42 BLL的GTC光谱（光谱范围4100 - 7750 AA）。我们能够将观测到的目标分类为BLL，并简要讨论了每个源。光谱允许我们根据发射和/或吸收线确定25个物体的红移，发现0.05 < z < 0.91。探测到的发射谱线主要是[O III]和[N II]的禁戒跃迁。观测到的线光度低于类星体在类似的连续性，可以调和与类星体的线-连续性光度关系，如果一个显着的聚束因子假设。此外，对于5个源，我们发现了介入吸收线，允许设置红移的光谱下限。对于剩下的25个源，其光谱是无线的，z的下限，假设宿主星系是巨大的椭圆星系。
英文摘要：
We investigate the spectroscopic optical properties of gamma-ray sources detected with high significance above 50 GeV in the Third Catalog of Hard Fermi-LAT Sources (3FHL) and that are good candidates as TeV emitters. We focus on the 91 sources that are labelled by the Fermi team as BL Lac objects (BLL) or Blazar candidates of uncertain type (BCU) , that are in the Northern hemisphere, and are with unknown or uncertain redshift. We report here on GTC spectra (in the spectral range 4100 - 7750 AA) of 13 BCU and 42 BLL. We are able to classify the observed targets as BLL and each source is briefly discussed. The spectra allowed us to determine the redshift of 25 objects on the basis of emission and/or absorption lines, finding 0.05 < z < 0.91. Most of the emission lines detected are due to forbidden transition of [O III] and [N II]. The observed line luminosity is found lower than that of QSOs at similar continuum and could be reconciled with the line-continuum luminosity relationship of QSOs if a significant beaming factor is assumed. Moreover for 5 sources we found intervening absorption lines that allows to set a spectroscopic lower limit of the redshift. For the remaining 25 sources, for which the spectra are lineless, a lower limit to z is given, assuming that the host galaxies are giant ellipticals.
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