Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21531407p&link_type=abstract
American Astronomical Society, AAS Meeting #215, #314.07; Bulletin of the American Astronomical Society, Vol. 42, p.315
Astronomy and Astrophysics
Astronomy
Scientific paper
We present recent results on the evolution of early-type galaxies (ETGs) from z=1 to the present-day using luminosity and correlation function measurements from MUSYC. The evolution of the number density of bright ETGs, selected so as to have similar passively evolved z=0 luminosities, is seen to increase down to redshifts as low as z˜0.3, consistent with recent results from models of galaxy formation as well as with previous observational estimates. By taking into account the clustering measurements which show that ETGs at a given redshift evolve into brighter galaxies at lower redshifts, we make a comparison between the number density of ETGs and their likely descendants at z = 0 in the context of a ΛCDM cosmology. We find that progenitors have higher number densities than their likely descendants (a factor of 3 to 10), hinting at a need for mergers. Given that the ratios of number densities and luminosities of parents and descendants are similar, our results show no need for strong star-formation episodes in ETGs since 1.
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