Cosmological evolution and hierarchical galaxy formation

Details Cosmological evolution and hierarchical galaxy formation Cosmological evolution and hierarchical galaxy formation

1998-09-24

arxiv.org/abs/astro-ph/9809322v1

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure. Presented at Xth Rencontres de Blois, "The Birth of Galaxies", June 1998

Scientific paper

We provide a new multi-waveband compilation of the data describing the cosmological evolution of quasars, and discuss a model that attributes the evolution to variation in the rate of merging between dark halos in a hierarchical universe. We present a new Press-Schechter calculation of the expected merger rate and show that this can reproduce the principal features of the evolution. We also show that the evolution in the star-formation history of the universe is well-described by this model.

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