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OTELO survey: deep BVRI broad-band photometry of the Groth strip I. Number counts and two-point correlation functions



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Cepa, J. and Pérez García, A. M. and Bongiovanni, A. and Alfaro, E. J. and Castañeda, H. and Gallego Maestro, Jesús and González Serrano, J. I. and Sánchez Portal, M. and González, J. J. (2008) OTELO survey: deep BVRI broad-band photometry of the Groth strip I. Number counts and two-point correlation functions. Astronomy and astrophysics, 490 (1). pp. 1-14. ISSN 0004-6361

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Official URL: http://dx.doi.org/10.1051/0004-6361:200810092


Context. The Groth field is one of the sky regions that will be targeted by the OTELO (OSIRIS Tunable Filter Emission Line Object) survey in the optical 820 nm and 920 nm atmospheric windows. A complementary broad-band photometric catalogue of the field is essential for several purposes, in particular the inequivocal identification of sources, photometric redshift estimation, and population synthesis fitting. Aims. We aim to describe the OTELO survey and present deep BVRI imaging data of the Groth field. Galaxy number counts, colour distributions and galaxy clustering are analysed. Methods. BVRI deep images (> 8 ks) were obtained with the Prime Focus Camera at the WHT (La Palma) and reduced with the IRAF package. The extraction and photometry of the sources was done with SExtractor software. We analysed the final catalogue to obtain galaxy number counts, as well as galaxy correlation functions as a function of I magnitude and V - I colour. It is also compared with estimations from mock catalogues of the Virgo-Millenium consortium. Results. We find excellent agreement between observed and mock data number counts. We also find evidence of galaxy clustering evolution and strong dependence of the angular correlation function on the observed V - I colour. Our data favour a flattening of the clustering amplitude with median apparent magnitude. The good general agreement between our clustering analysis and the estimates from the mock data is remarkable.

Item Type:Article
Additional Information:

© ESO 2008. This work was supported by the Spanish Plan Nacional de Astronomía y Astrofísica under grants AYA2005-04149 and AYA2006-2358. We thank the referee for helpful comments that improved the clarity of this paper. The Millennium Simulation databases used in this paper and the web application providing online access to them were constructed as part of the activities of the German Astrophysical Virtual Observatory.IRAF is distributed by the National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA) under cooperative agreement with the National Science Foundation. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation.

Uncontrolled Keywords:Digital sky survey; Angular-correlation function; Galaxy redshift survey; Lyman break galaxies; X-ray sources; Faint galaxies; Luminosity function; Field-North; Wide-field; Source extraction
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:34195
Deposited On:10 Nov 2015 13:18
Last Modified:10 Dec 2018 15:05

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