The Race to Build Supermassive Black Holes

Details The Race to Build Supermassive Black Holes The Race to Build Supermassive Black Holes

2003-08-30

arxiv.org/abs/astro-ph/0309008v1

Astronomy and Astrophysics

Astrophysics

15 pages, submitted to ApJ

Scientific paper

The high redshifts of the most distant known quasars, and the best estimates of their black hole masses, require that supermassive black holes (SMBHs) must have formed very early in history. Several mechanisms for creating and growing these holes have been proposed. Here we present an evaluation of the timescales needed for various critical processes in order to discriminate between the proposed scenarios. We find in particular that mergers alone are not able to grow the black holes at a sufficient rate. Accretion models offer a solution and we use accretion timescales to constrain the manner in which the black hole was first formed. This analysis implies, but does not require, the action of some unconventional process.

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