Day: June 27, 2013

Dwarf Galaxies in a Dense Environment

Dwarf galaxies are the most common galaxy type in the Universe.  They come in a few different flavors. The ones in the dense Coma cluster of galaxies are inert (i.e., non-star-forming) and belong to a class of galaxies known as “dwarf ellipticals” (dEs).  The physical origin of this class of galaxies remains poorly understood.  The…Continue Reading Dwarf Galaxies in a Dense Environment

Scattered Light from Quasars: Connecting Deep Observations with State-of-the-Art Computer Simulations

Quasars are the most luminous persistent sources in the sky, powered by rapid accretion onto a supermassive black hole in the center of a galaxy. The extreme energy output of a quasar is theorized to cause dramatic impacts on their host galaxies, like rapidly quenching star formation and launching enormous jets.  But measuring the properties…Continue Reading Scattered Light from Quasars: Connecting Deep Observations with State-of-the-Art Computer Simulations

The Role of Supermassive Black Holes in Quenching and Triggering Star Formation

Every galaxy hosts a supermassive black hole in its center, and the masses of each are correlated over several orders of magnitude.  This suggests that the mass growth of a galaxy (through star formation) is tightly coupled to the mass growth of its black hole (through accretion of gas and stars).  But the physics behind…Continue Reading The Role of Supermassive Black Holes in Quenching and Triggering Star Formation