Their spectra can show the Gunn-Peterson trough if the light passed through interstellar hydrogen and the existence of one of these appearing as two separate objects around a galaxy gives evidence of gravitational lensing.
Their spectra can show the Gunn-Peterson trough if the light passed through interstellar hydrogen and the existence of one of these appearing as two separate objects around a galaxy gives evidence of gravitational lensing. They are similar to Seyfert galaxies and BL Lacertae Objects, the latter of which along with the OVV type of these make up the blazars. Their output is across a wide range of the spectrum and they show variation over time in brightness. For 10 points, identify these distant radiative objects that are believed to be powered by supermassive black holes.
Their spectra can show the Gunn-Peterson trough if the light passed through interstellar hydrogen and the existence of one of these appearing as two separate objects around a galaxy gives evidence of gravitational lensing.
{quasar} [accept quasistellar {radio sources}]