Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21331304q&link_type=abstract
American Astronomical Society, AAS Meeting #213, #313.04; Bulletin of the American Astronomical Society, Vol. 41, p.290
Astronomy and Astrophysics
Astronomy
Scientific paper
Until recently it was thought that the early universe was dominated by low-mass galaxies undergoing rapid star formation. But deep near-infrared (NIR) surveys have uncovered a population of red, massive galaxies at z=2-3 with a wide range of star formation rates. This talk is concerned with the identification and analysis of red galaxies at these redshifts, and particularly with their clustering properties. First, we present deep NIR imaging from the Multiwavelength Survey by Yale-Chile (MUSYC). These data are used to assess differences between several sets of selection criteria that are commonly used to identify distant galaxies, including the J-K>2.3 criterion for distant red galaxies (DRGs). Next, we present MUSYC results for galaxy clustering at z 2.5. While the broad population of NIR-selected galaxies clusters similarly to the low-mass, star-forming galaxies found in previous surveys, the reddest galaxies have much higher correlation lengths. This suggests that a color-density relationship was in place at these redshifts. We use the clustering results to estimate the mass of the dark matter halos that host NIR-selected galaxies. We find that the reddest galaxies, which include DRGs, significantly outnumber the halos that are massive enough to host them. This suggests that the observations may be incompatible with the models. To test whether this discrepancy is an artifact due to limited field size, we also investigate the clustering of DRGs in the larger UKIDSS Ultra-Deep Survey, but the models remain inconsistent with the observations. The disagreement could be due to inaccurate photometric redshifts or to incorrect models. An explanation for this disagreement will result in a more complete understanding of the relationship between different galaxy populations, and of the relationship between galaxy evolution and dark matter.
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