Evolution of the Galaxy Luminosity Function Between 0.5<z<5

Details Evolution of the Galaxy Luminosity Function Between 0.5<z<5 Evolution of the Galaxy Luminosity Function Between 0.5<z<5

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.3801c&link_type=abstract

American Astronomical Society Meeting 205, #38.01; Bulletin of the American Astronomical Society, Vol. 36, p.1404

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We measure the galaxy luminosity function, from the present to z ˜ 5, using the extensive spectroscopic and photometric information in the Hawaii-Hubble Deep Field North (H-HDF-N). We find that the average star formation rate per galaxy is declining as a power law - with a slope of 3.3 from z<5 to the present. In conjunction with this downsizing, the faint-end slope of the star forming luminosity function is evolving from α = 1.63± 0.12 at z ˜ 3 to α = 1.27 ± 0.08 at z = 0.5. Integrating these luminosity functions we find that the ultraviolet luminosity density rises from z ˜ 5, peaks at z ˜ 2.5, and then declines as a power law with a slope of 2.0 for z < 2. On the other hand the rest-frame red light density declines much more slowly from z ˜ 1.4 to the present. These differences in luminosity density evolution indicate that most of the stellar mass was either formed early in the universe or the population is passively evolving.

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