de la Torre, S. and Le Fèvre, O. and Arnouts, S. and Guzzo, L. and Farrah, D. and Iovino, A. and Lonsdale, C. J. and Meneux, B. and Oliver, S. J. and Pollo, A. and Waddington, I. and Bottini, D. and Fang, F. and Garilli, B. and Le Brun, V. and Maccagni, D. and Picat, J. P. and Scaramella, R. and Scodeggio, M. and Shupe, D. and Surace, J. and Tresse, L. and Vettolani, G. and Zanichelli, A. and Adami, C. and Bardelli, S. and Bolzonella, M. and Cappi, A. and Charlot, S. and Ciliegi, P. and Contini, T. and Foucaud, S. and Franzetti, P. and Gavignaud, I. and Ilbert, O. and Lamareille, F. and McCracken, H. J. and Marano, B. and Marinoni, C. and Mazure, A. and Merighi, R. and Paltani, S. and Pellò, R. and Pozzetti, L. and Radovich, M. and Zamorani, G. and Zucca, E. and Bondi, M. and Bongiorno, A. and Brinchmann, J. and Cucciati, O. and Mellier, Y. and Merluzzi, P. and Temporin, S. and Vergani, D. and Walcher, C. J. (2007) VVDS-SWIRE - Clustering evolution from a spectroscopic sample of galaxies with redshift 0.2 < z < 2.1 selected from Spitzer IRAC 3.6 μ m and 4.5 μ m photometry. Astronomy and Astrophysics, 475 (2). pp. 443-451. ISSN 0004-6361 http://resolver.caltech.edu/CaltechAUTHORS:20091203-110622102
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Aims. By combining data from the VIMOS VLT Deep Survey (VVDS) with the Spitzer Wide-area InfraRed Extragalactic survey (SWIRE), we have built the currently largest spectroscopic sample of high redshift galaxies selected in the rest-frame near-infrared. We have obtained 2040 spectroscopic redshifts of galaxies with (m_(3.6))_(AB) < 21.5 at 3.6 μm, and 1255 spectroscopic redshifts of galaxies with (m_(4.5))_(AB) < 21. These allow us to investigate the clustering evolution of galaxies selected via their rest-frame near-infrared luminosity in the redshift range 0.2 < z < 2.1. Methods. We use the projected two-point correlation function w_p(r_p) to study the three dimensional clustering properties of galaxies detected at 3.6 μm and 4.5 μm with the InfraRed Array Camera (IRAC) in the SWIRE survey with measured spectroscopic redshifts from the first epoch VVDS. We compare these properties to those of a larger sample of 16672 SWIRE galaxies for which we have accurate photometric redshifts in the same field. Results. We find that in the 3.6 μm and 4.5 μmm flux limited samples, the apparent correlation length does not change from redshift ~2 to the present. The measured correlation lengths have a mean value of r_0 ≃ 3.9 ± 0.5 h^(-1) Mpc for the galaxies selected at 3.6 μm and a mean value of r_0 ≃ 4.4 ± 0.5 h^(-1) Mpc for the galaxies selected at 4.5 μm, across the whole redshift range explored. These values are larger than those typicaly found for I-band selected galaxies at I_(AB) < 24, for which r_0 varies from 2.69 h^(-1) Mpc to 3.63 h^(-1) Mpc between z = 0.5 to z = 2.1. We find that the difference in correlation length between I-band and 3.6-4.5 μm selected samples decreases with increasing redshift, becoming comparable at z ≃ 1.5. We interpret this as evidence that galaxies with older stellar populations and galaxies actively forming stars reside in comparably over-dense environments at epochs earlier than z ≃ 1.5, supporting the recently reported flattening of the color-density relation at high redshift. The increasing difference in correlation length with cosmic time observed between rest-frame UV-optical and near-infrared selected samples could then be an indication that star formation is gradually shifting to lower density regions with decreasing redshift, while the older, passively evolving galaxies remain in the most over-dense peaks.
|Additional Information:||© 2007 ESO. Received 24 January 2007; accepted 26 July 2007. Based on data obtained with the European Southern Observatory Very Large Telescope, Paranal, Chile, program 070.A-9007(A), and on data obtained at the Canada-France-Hawaii Telescope, operated by the CNRS of France, CNRC in Canada and the University of Hawaii, and observations obtained with MegaPrime/MegaCam, a joint project of CFHT and CEA/DAPNIA, at the Canada-France-Hawaii Telescope (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 Canada-France-Hawaii Telescope Legacy Survey, a collaborative project of NRC and CNRS. This research has been developed within the framework of the VVDS consortium. This work has been partially supported by the CNRS-INSU and its Programme National de Cosmologie (France), and by Italian Ministry (MIUR) grants COFIN2000 (MM02037133) and COFIN2003 (Num. 2003020150). The VLT-VIMOS observations have been carried out on guaranteed time (GTO) allocated by the European Southern Observatory (ESO) to the VIRMOS consortium, under a contractual agreement between the Centre National de la Recherche Scientifique of France, heading a consortium of French and Italian institutes, and ESO, to design, manufacture and test the VIMOS instrument.|
|Subject Keywords:||cosmology: observations; cosmology: large-scale structure of Universe; galaxies: evolution; galaxies: high-redshift; galaxies: statistics; infrared: galaxies|
|Official Citation:||VVDS-SWIRE - Clustering evolution from a spectroscopic sample of galaxies with redshift 0.2 < z < 2.1 selected from Spitzer IRAC 3.6 μ m and 4.5 μ m photometry S. de la Torre, O. Le Fèvre, S. Arnouts, L. Guzzo, D. Farrah, A. Iovino, C. J. Lonsdale, B. Meneux, S. J. Oliver, A. Pollo, I. Waddington, D. Bottini, F. Fang, B. Garilli, V. Le Brun, D. Maccagni, J. P. Picat, R. Scaramella, M. Scodeggio, D. Shupe, J. Surace, L. Tresse, G. Vettolani, A. Zanichelli, C. Adami, S. Bardelli, M. Bolzonella, A. Cappi, S. Charlot, P. Ciliegi, T. Contini, S. Foucaud, P. Franzetti, I. Gavignaud, O. Ilbert, F. Lamareille, H. J. McCracken, B. Marano, C. Marinoni, A. Mazure, R. Merighi, S. Paltani, R. Pellò, L. Pozzetti, M. Radovich, G. Zamorani, E. Zucca, M. Bondi, A. Bongiorno, J. Brinchmann, O. Cucciati, Y. Mellier, P. Merluzzi, S. Temporin, D. Vergani and C. J. Walcher A&A 475 (2) 443-451 (2007) DOI: 10.1051/0004-6361:20077161|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||03 Dec 2009 21:44|
|Last Modified:||26 Dec 2012 11:36|
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