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Title:
Massive and Evolved Galaxies at z >= 5
Authors:
Wiklind, T.; Mobasher, B.; Dickinson, M.; Ferguson, H.; Giavalisco, M.; Grogin, N.; Panagia, N.
Publication:
Galaxy Evolution Across the Hubble Time, Edited by F. Combes and J. Palous, Proceedings of the International Astronomical Union 2, IAU Symposium #235, held 14-17 August, 2006 in Prague, Czech Republic. Cambridge: Cambridge University Press, 2007., pp.368-372
Publication Date:
00/2007
Origin:
CUP
DOI:
10.1017/S1743921306010192
Bibliographic Code:
2007IAUS..235..368W

Abstract

Combining HST/ACS, VLT/ISAAC and Spitzer/IRAC data on the GOODS south field, we have detected a population of massive, i.e. >1011 Mo, and evolved galaxies. The ages inferred from population synthesis models range from 200 Myr up to 1 Gyr. The galaxies show very low levels of current star formation and contains no dust. In total we find 19 candidate galaxies at z=5-7. The majority of the stars in these galaxies have formation redshift in the range z˜9-25. One candidate galaxy has a spectroscopically confirmed redshift, which agrees well with our photometric redshift. The candidate galaxies are small and compact, with a mean half-light radius of 0.34", corresponding to a radius ˜2 kpc. Defining a core sample of 12 candidate galaxies with the highest confidence limits and estimating our completeness to ˜50%, the comoving number density of galaxies at z=5.8 and with a stellar mass >1011 Mo is 3.6 10-5 Mpc-3 and the stellar mass density is 8 106 Mo Mpc-3. With a cosmological Mbaryon/Mtotal ratio of 0.13, the number density of our candidate galaxies is ˜6 times higher than the expected number of dark matter halos. The stellar mass density is 2-3% of the present day total stellar mass density and 20-25% of the stellar mass density at z˜2.
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