OSIRIS (Optical System for Imaging and low/intermediate-Resolution Integrated Spectroscopy) will ... more OSIRIS (Optical System for Imaging and low/intermediate-Resolution Integrated Spectroscopy) will be one of the Day One instruments for the Spanish 10.4m telescope GTC at La Palma. One of the scientific projects to be addressed with OSIRIS is the study of the galaxy population in clusters of galaxies at high redshift. Part of the cluster sample could be selected by means of the Sunyaev-Zeldovich effect as provided by the Gran Telescopio Milimétrico (GTM). The optical survey will be complemented using other future facilities in the NIR such as the Espectrógrafo Multiobjeto InfraRojo (EMIR), also in the GTC. The spectroscopic and photometric capabilities of PACS and SPIRE covering the spectral range 60 - 670 microns, will both feed this survey and allow us to complement and extend it. In summary, the combination of the GTM, OSIRIS and FIRST capabilities will likely provide a deep insight into the evolution of clusters of galaxies and galaxies in clusters. Although only one of the OSIRIS scientific projects is outlined here, most of the OSIRIS projects, developed and carried out by the OSIRIS Scientific Team, will use FIRST instruments to tackle their scientific objectives.
Context: The Groth field is one of the sky regions that will be targeted by the OTELO (OSIRIS Tun... more 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. Based on observations obtained at the 4.2 m WHT telescope operated on the island of La Palma by the Isaac Newton Group of Telescopes in the Spanish Observatorio del Roque de Los Muchachos of the Instituto de Astrofísica de Canarias.
OSIRIS (Optical System for Imaging and low/intermediate-Resolution Integrated Spectroscopy) will ... more OSIRIS (Optical System for Imaging and low/intermediate-Resolution Integrated Spectroscopy) will be one of the Day One instruments for the Spanish 10.4m telescope GTC at La Palma. One of the scientific projects to be addressed with OSIRIS is the study of the galaxy population in clusters of galaxies at high redshift. Part of the cluster sample could be selected by means of the Sunyaev-Zeldovich effect as provided by the Gran Telescopio Milimétrico (GTM). The optical survey will be complemented using other future facilities in the NIR such as the Espectrógrafo Multiobjeto InfraRojo (EMIR), also in the GTC. The spectroscopic and photometric capabilities of PACS and SPIRE covering the spectral range 60 - 670 microns, will both feed this survey and allow us to complement and extend it. In summary, the combination of the GTM, OSIRIS and FIRST capabilities will likely provide a deep insight into the evolution of clusters of galaxies and galaxies in clusters. Although only one of the OSIRIS scientific projects is outlined here, most of the OSIRIS projects, developed and carried out by the OSIRIS Scientific Team, will use FIRST instruments to tackle their scientific objectives.
Context: The Groth field is one of the sky regions that will be targeted by the OTELO (OSIRIS Tun... more 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. Based on observations obtained at the 4.2 m WHT telescope operated on the island of La Palma by the Isaac Newton Group of Telescopes in the Spanish Observatorio del Roque de Los Muchachos of the Instituto de Astrofísica de Canarias.
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