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Clustering Properties of Rest-Frame UV-Selected Galaxies. II. Migration of Star Formation Sites with Cosmic Time from GALEX and CFHTLS

Heinis, Sébastien and Wyder, Ted K. and Barlow, Tom A. and Forster, Karl and Friedman, Peter G. and Martin, D. Christopher and Morrissey, Patrick and Seibert, Mark and Small, Todd and Xu, C. K. (2007) Clustering Properties of Rest-Frame UV-Selected Galaxies. II. Migration of Star Formation Sites with Cosmic Time from GALEX and CFHTLS. Astrophysical Journal Supplement Series, 173 (2). pp. 503-511. ISSN 0067-0049. http://resolver.caltech.edu/CaltechAUTHORS:20100923-113018914

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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 data sets 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 (r_0 and δ) on the ultraviolet luminosity, as well as the linear bias evolution. We find that the bias parameter shows a gradual decline from high (b_8 ≳ 2) to low redshift (b_8 ≃ 0.79_(−0.08)^(+0.1)). 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_⊙ ≤ M_(min) ≤ 10^(13) M_⊙, located in high-density regions) to less massive halos at low redshift (M_(min) ≤ 10^(12) M_⊙, 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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1086/520580DOIUNSPECIFIED
http://iopscience.iop.org/0067-0049/173/2/503PublisherUNSPECIFIED
Additional Information:© 2007 The American Astronomical Society. Received 2006 August 22; accepted 2007 May 31. We thank Christian Marinoni for stimulating discussions. GALEX (Galaxy Evolution Explorer) is a NASA Small Explorer, launched in 2003 April. We gratefully acknowledge NASA’s support for construction, operation, and science analysis for the GALEX mission, developed in cooperation with the Centre National d’Etudes Spatiales of France and the Korean Ministry of Science and Technology. This study is also based on observations obtained with MegaPrime/MegaCam, a joint project of the Canada-France- Hawaii Telescope (CFHT) and CEA/DAPNIA, at CFHT, which is operated by the National Research Council (NRC) of Canada, the Institut National des Science de l’Univers of the Centre National de la Recherche Scientifique (CNRS) of France, and the University of Hawaii. This work is based in part on data products produced at TERAPIX and the Canadian Astronomy Data Centre as part of the CFHT Legacy Survey, a collaborative project of NRC and CNRS.
Group:Space Radiation Laboratory, Space Astrophysics Laboratory
Subject Keywords:stars: formation; ultraviolet: galaxies
Record Number:CaltechAUTHORS:20100923-113018914
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20100923-113018914
Official Citation:Sébastien Heinis et al 2007 ApJS 173 503 doi: 10.1086/520580
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20103
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:24 Sep 2010 19:01
Last Modified:31 Oct 2017 22:11

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