The Clustering of Star-Forming and Passive Galaxies at z˜ 2

Details The Clustering of Star-Forming and Passive Galaxies at z˜ 2 The Clustering of Star-Forming and Passive Galaxies at z˜ 2

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..399...90a&link_type=abstract

Panoramic Views of Galaxy Formation and Evolution ASP Conference Series, Vol. 399, proceedings of the conference held 11-16 Dece

Astronomy and Astrophysics

Astronomy

Scientific paper

We present early results on the clustering of galaxies at z˜ 2, selected using the BzK colour technique from the UKIDSS Ultra-Deep Survey (UDS). The passive (pBzK) galaxies are the most strongly clustered, consistent with inhabiting dark-matter halos in excess of 10^{13}M_{&sun;} at these redshifts. Starforming (sBzK) galaxies are less strongly clustered, but reveal an excess of pairs on small scales (<1Mpc) which suggest multiple halo occupation. The number counts of these populations are also markedly different, with the pBzK galaxies showing a sharp flattening beyond K_{AB}=21, while the counts of star-forming (sBzK) galaxies continue to rise steeply towards faint magnitudes. We conclude that only very luminous galaxies (M_K(AB)<-23) are passively evolving at z˜ 2, and these inhabit the most massive dark-matter halos. These findings are consistent with the `downsizing' scenario for the build-up of the passive red sequence.

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