Sentences with phrase «probed by quasars»
The blue / white narrow beam indicates the small area of the DLA gas cloud probed by quasars, the wider red cone of light indicates the large area of the DLA probed by galaxies, which is a 100 million-fold increase in area.
http://www.keckobservatory.org/ Not exact matches
To probe the cloud, the team used an even more distant quasar — a hugely bright light source powered by a supermassive black hole — as a backlight.
«Using space VLBI, we can probe the cores of quasars and active galaxies, believed to be powered by super massive black holes,» said Dr. Robert Preston, project scientist for the U.S. Space Very Long Baseline Interferometry project at JPL.
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.