falling matter as the source of their intense luminosity.
The most distant of these objects exhibit Gunn-Peterson troughs in their spectra, indicating they were formed before the re-ionization of the universe completed. Only 10 percent are "radio loud," they are similar to BL Lac and Seyfert objects. 3C 273, one of the first of these discovered, is also one of the few that can be viewed through an amateur-quality telescope. They are believed to be powered by super-massive black holes at their centers, with in- falling matter as the source of their intense luminosity. Considered a type of active galaxy, for ten points, name these extremely energetic celestial objects
The most distant of these objects exhibit Gunn-Peterson troughs in their spectra, indicating they were formed before the re-ionization of the universe completed.
{qua}si-{s}tell{ar} objects