Sentences with phrase «revealed by a quasar»
«This is not the first time astronomers have found a galaxy with nearby gas, revealed by a quasar.
http://www.keckobservatory.org/ Not exact matches
The new x-ray observations, presented by Yale University astronomer Kevin Schawinski, reveal that the quasar is no longer active, probably because the black hole ran out of food.
According to the researchers, the neutral hydrogen gas revealed by its absorption of quasar light is most likely part of a large halo or perhaps an extended disk of gas around the galaxy.
SDSS studies have probed the dark matter environments of quasars through clustering measurements, revealed populations of quasars whose central engines are hidden by obscuring dust, captured changes in quasar spectra that show clouds moving in the gravitational grip of the central black hole, and allowed a comprehensive census of the much fainter accreting black holes (active galactic nuclei, or AGN) in present - day galaxies.