OVVs and BL Lacs are types of these objects, whose spectra feature UV gaps known as Gunn-Peterson troughs and "forests" of absorption lines in the Lyman-alpha transition range. The first of these discovered was 3C 273 in the constellation Virgo. Gravitational lensing was first observed in one of these objects, which may be radio-loud or radio-quiet. They have very high redshifts, indicating that they are very distant. They are thought to be powered by accretion disks surrounding supermassive black holes. For 10 points, name these most luminous objects in the universe, named for their resemblance to stars.
OVVs and BL Lacs are types of these objects, whose spectra feature UV gaps known as Gunn-Peterson troughs and "forests" of absorption lines in the Lyman-alpha transition range. The first of these discovered was 3C 273 in the constellation Virgo. Gravitational lensing was first observed in one of these objects, which may be radio-loud or radio-quiet. They have very high redshifts, indicating that they are very distant. They are thought to be powered by accretion disks surrounding supermassive black holes. For 10 points, name these most luminous objects in the universe, named for their resemblance to stars.
OVVs and BL Lacs are types of these objects, whose spectra feature UV gaps known as Gunn-Peterson troughs and "forests" of absorption lines in the Lyman-alpha transition range.
quasar or quasi-stellar objects [prompt on "blazars"; prompt on "active galactic nuclei"] 