Luminous quasars and their hosts: Accretion at the limit?

Details Luminous quasars and their hosts: Accretion at the limit? Luminous quasars and their hosts: Accretion at the limit?

2003-03-03

arxiv.org/abs/astro-ph/0303037v1

Astronomy and Astrophysics

Astrophysics

6 pages, 3 EPS figures. To appear in "Carnegie Observatories Astrophysics Series, Vol. 1: Coevolution of Black Holes and Galax

Scientific paper

We present the results of our recent Hubble Space Telescope imaging study, in which we have successfully deconvolved host and nuclear flux for the some of the most luminous quasars in the Universe. Host morphologies have been recovered for each of our 17-strong sample. From these fits, we have estimated Black Hole masses through extrapolation of the Black Hole - Spheroid mass relation and begun to address the complicated issue of fuelling vs black hole mass in determining quasar luminosity: We find that the order-of-magnitude increase in luminosity is due to increased black hole size, and to increased fuelling efficiency, in roughly equal measure. The brightest objects are found to radiate at or near the Eddington limit.

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