BL Lac objects beyond z=1.3

Observations of the {gamma}-ray sky with Fermi led to significant advances towards understanding blazars, the most extreme class of active galactic nuclei. A large fraction of...借助费米（Fermi）望远镜开展的伽马射线（gamma-ray）天区观测，在理解耀变体（blazars，一类最为极端的活动星系核（active galactic nuclei））方面取得了显著进展。其中相当比例的……