Hildebrandt, H. and Pielorz, J. and Erben, T. and van Waerbeke, L. and Simon, P. and Capak, P. (2009) CARS: the CFHTLS-Archive-Research Survey. II. Weighing dark matter halos of Lyman-break galaxies at z = 3–5. Astronomy and Astrophysics, 498 (3). pp. 725-736. ISSN 0004-6361 http://resolver.caltech.edu/CaltechAUTHORS:20090827-094216573
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Aims. We measure the clustering properties for a large samples of u- (z ~ 3), g- (z ~ 4), and r- (z ~ 5) 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 ~ 5 . 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 ≳ 10^(12)h^(-1) M⊙ 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.
|Additional Information:||© ESO 2009. Received 26 September 2008. Accepted 18 March 2009. We would like to thank Ryan Quadri for interesting discussions about galaxy clustering measurements that helped to improve the paper. Many thanks also to Claudia Maraston and Janine Pforr for help with their template set. We are grateful to the CFHTLS survey team for conducting the observations and the TERAPIX team for developing software used in this study. We acknowledge use of the Canadian Astronomy Data Centre operated by the Dominion Astrophysical Observatory for the National Research Council of Canada’s Herzberg Institute of Astrophysics. This work was supported by the DFG priority program SPP-1177 “Witnesses of Cosmic History: formation and evolution of black holes, galaxies and their environment” (project ID ER327/2- 2), the German Ministry for Science and Education (BMBF) through DESY under the project 05AV5PDA/3 and the TR33 “The Dark Universe”. H.H. and P.S. were supported by the European DUEL RTN, project MRTN-CT-2006-036133. LVW was supported by the Canadian Foundation for Innovation, NSERC and CIfAR.|
|Subject Keywords:||techniques: photometric; galaxies: evolution; galaxies: halos; galaxies: high-redshift|
|Official Citation:||CARS: the CFHTLS-Archive-Research Survey - II. Weighing dark matter halos of Lyman-break galaxies at z = 3–5 H. Hildebrandt, J. Pielorz, T. Erben, L. van Waerbeke, P. Simon and P. Capak A&A 498 (3) 725-736 (2009) DOI: 10.1051/0004-6361/200811042.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||04 Sep 2009 15:55|
|Last Modified:||26 Dec 2012 11:15|
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