Clustering Properties of restframe UV selected galaxies II: Migration of Star Formation sites with cosmic time from GALEX and CFHTLS

Abstract

We analyze the clustering properties of ultraviolet selected galaxies by using GALEX-SDSS data at z<0.6 and CFHTLS deep u' imaging at z=1. These datasets provide a unique basis at z< 1 which can be directly compared with high redshift samples built with similar selection criteria. We discuss the dependence of the correlation function parameters (r0, delta) on the ultraviolet luminosity as well as the linear bias evolution. We find that the bias parameter shows a gradual decline from high (b > 2) to low redshift (b ~ 0.79^{+0.1}_{-0.08}). When accounting for the fraction of the star formation activity enclosed in the different samples, our results suggest that the bulk of star formation migrated from high mass dark matter halos at z>2 (10^12 < M_min < 10^13 M_sun, located in high density regions), to less massive halos at low redshift (M_min < 10^12 M_sun, located in low density regions). This result extends the ``downsizing'' picture (shift of the star formation activity from high stellar mass systems at high z to low stellar mass at low z) to the dark matter distribution.

Accepted for Publication in the Special GALEX Ap. J. Supplement, December 2007 Version with full resolution fig1 available at http://taltos.pha.jhu.edu/~sebastien/papers/Galex_p2.ps.gz

References in corpus (3)

• Definitive Identification of the Transition between Small- to Large-Scale Clustering for Lyman Break Galaxies
• Clustering Properties of restframe UV selected galaxies I: the correlation length derived from GALEX data in the local Universe
• The Environmental Impact of Lyman-break Galaxies

Cited by in corpus (11)

• COSMOS Photometric Redshifts with 30-bands for 2-deg2
• The Evolution of Active Galactic Nuclei in Clusters of Galaxies to Redshift 1.3
• The evolution of galaxy clustering since z = 3 using the UKIDSS Ultra Deep Survey: the divergence of passive and star-forming galaxies
• Supermassive Black Holes and Their Environments
• The Properties of Radio Galaxies and the Effect of Environment in Large Scale Structures at $z\sim 1$
• The WiggleZ Dark Energy Survey: small-scale clustering of Lyman Break Galaxies at z < 1
• Clustering Properties of restframe UV selected galaxies I: the correlation length derived from GALEX data in the local Universe
• Studying Large and Small Scale Environments of Ultraviolet Luminous Galaxies
• Galaxy and Mass Assembly (GAMA): Tracing galaxy environment using the marked correlation function
• Angular clustering of z~2 star-forming and passive galaxies in 2.5 square degrees of deep CFHT imaging
• Hosts and environments: a (large-scale) radio history of AGN and star-forming galaxies