CARS: the CFHTLS-Archive-Research Survey

Free access article

Issue		A&A Volume 498, Number 3, May II 2009


Page(s)		725 - 736
Section		Extragalactic astronomy
DOI		http://dx.doi.org/10.1051/0004-6361/200811042
Published online		25 March 2009

A&A 498, 725-736 (2009)
DOI: 10.1051/0004-6361/200811042

II. Weighing dark matter halos of Lyman-break galaxies at z = 3–5

H. Hildebrandt¹, J. Pielorz², T. Erben², L. van Waerbeke³, P. Simon⁴, and P. Capak⁵

¹ Leiden Observatory, Leiden University, Niels Bohrweg 2, 2333CA Leiden, The Netherlands
e-mail: hendrik@strw.leidenuniv.nl
² Argelander-Institut für Astronomie, Auf dem Hügel 71, 53121 Bonn, Germany
³ University of British Columbia, Department of Physics and Astronomy, 6224 Agricultural Road, Vancouver, B.C. V6T 1Z1, Canada
⁴ The Scottish Universities Physics Alliance (SUPA), Institute for Astronomy, School of Physics, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK
⁵ Spitzer Science Center, 314-6, California Institute of Technology, 1201 E. California Blvd, Pasadena, CA, 91125, USA

Received 26 September 2008 / Accepted 18 March 2009

Abstract
Aims. We measure the clustering properties for a large samples of u- ( $z\sim3$ ), g- ( $z\sim4$ ), and r- ( $z\sim5$ ) dropouts from the Canada-France-Hawaii Telescope Legacy Survey (CFHTLS) Deep fields.
Methods. Photometric redshift distributions along with simulations allow us to de-project the angular correlation measurements and estimate physical quantities such as the correlation length, halo mass, galaxy bias, and halo occupation as a function of UV luminosity.
Results. For the first time we detect a significant one-halo term in the correlation function at $z\sim5$ . The comoving correlation lengths and halo masses of LBGs are found to decrease with decreasing rest-frame UV-luminosity. No significant redshift evolution is found in either quantity. The typical halo mass hosting an LBG is $M\ga10^{12}~h^{-1}~M_\odot$ and the halos are typically occupied by less than one galaxy. Clustering segregation with UV luminosity is clearly observed in the dropout samples, however redshift evolution cannot clearly be disentangled from systematic uncertainties introduced by the redshift distributions. We study a range of possible redshift distributions to illustrate the effect of this choice. Spectroscopy of representative subsamples is required to make high-accuracy absolute measurements of high-z halo masses.

Key words: techniques: photometric -- galaxies: evolution -- galaxies: halos -- galaxies: high-redshift

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