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Studying the emergence of the red sequence through galaxy clustering: host halo masses at z > 2

W. G. Hartley, O. Almaini, A. Mortlock, C. J. Conselice, R. GrŁtzbauch, C. Simpson, E. J. Bradshaw, R. W. Chuter, S. Foucaud, M. Cirasuolo, J. S. Dunlop, R. J. McLure, H. J. Pearce

Abstract
We use the United Kingdom Infrared Telescope Deep Sky Survey(UKIDSS) Ultra Deep Survey(UDS),the deepest degree-scale near-infrared survey to date, to investigate the clustering of star-forming and passive galaxies to z ė 3.5. Our new measurements include the first determination of the clustering for passive galaxies at z > 2, which we achieve using a cross-correlation technique. We find that passive galaxies are the most strongly clustered, typically hosted by massive dark matter haloes with Mhalo > 5 ◊ 1012 M&sun; irrespective of redshift or stellar mass. Our findings are consistent with models in which a critical halo mass determines the transition from star-forming to passive galaxies. Star-forming galaxies show no strong correlation between stellar mass and halo mass, but passive galaxies show evidence for an anticorrelation; low-mass passive galaxies appear, on average, to be located in the most massive haloes. These results can be understood if the termination of star formation is most efficient for galaxies of low stellar mass in very dense environments.

Keywords
galaxies: evolution - galaxies: formation - galaxies: high-redshift - large-scale: structure: of: Universe - infrared: galaxies

Monthly Notices of the Royal Astronomical Society
Volume 431, Issue 4, Page 4_3045
2013 April

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Instituto de Astrof√≠sica e Ci√™ncias do Espa√ßo Universidade do Porto Faculdade de Ciências da Universidade de Lisboa Funda√ß√£o para a Ci√™ncia e a Tecnologia
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