The new studies accounted for the black holes responsible for between 70 and 90 percent of the X-rays coming from the two patches of sky. Tananbaum said the researchers found high concentrations of iron in the quasar, which provides a glimpse of the chemical makeup of the early universe. When researchers first detected their radio emissions, they thought they were stars. Their name is short for quasi-stellar radio sources. They are now known to be old, distant, and powerful.
Astronomers think quasars are powered by massive black holes.
A type II quasar is surrounded by, or buried in, an occluding cloud of gas and dust that reduces its brightness in visible light, so they can only be studied well in X-rays. Norman said the gas and dust is likely the material that feeds the voracious black hole. As the quasar matures, the extremely powerful radiation it emits disperses the shroud of gas and dust. We're very eager to get a sense of how prevalent they are, and to compare that to type I quasars. An answer may come fast.