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http://hdl.handle.net/20.500.12386/23502
Titolo: | The VIMOS Ultra-Deep Survey: ~10 000 galaxies with spectroscopic redshifts to study galaxy assembly at early epochs 2 < z ≃ 6 | Autori: | Le Fèvre, O. Tasca, L. A. M. Cassata, P. GARILLI, BIANCA MARIA ROSA Le Brun, V. Maccagni, D. PENTERICCI, Laura Thomas, R. VANZELLA, Eros Zamorani, G. ZUCCA, Elena Amorin, R. BARDELLI, Sandro Capak, P. Cassarà, L. CASTELLANO, MARCO Cimatti, A. Cuby, J. G. CUCCIATI, Olga de la Torre, S. Durkalec, A. FONTANA, Adriano Giavalisco, M. GRAZIAN, Andrea Hathi, N. P. Ilbert, O. Lemaux, B. C. Moreau, C. Paltani, S. Ribeiro, B. Salvato, M. Schaerer, D. SCODEGGIO, MARCO Sommariva, V. Talia, M. Taniguchi, Y. Tresse, L. VERGANI, DANIELA Wang, P. W. Charlot, S. Contini, T. Fotopoulou, S. López-Sanjuan, C. Mellier, Y. Scoville, N. |
Data pubblicazione: | 2015 | Rivista: | ASTRONOMY & ASTROPHYSICS | Numero: | 576 | Da pagina:: | A79 | Abstract: | We present the VIMOS Ultra Deep Survey (VUDS), a spectroscopic redshift survey of ~10 000 very faint galaxies to study the main phase of galaxy assembly in 2 < z ≃ 6. The survey covers 1 deg<SUP>2</SUP> in three separate fields: COSMOS, ECDFS, and VVDS-02h, with the selection of targets based on an inclusive combination of photometric redshifts and colour properties. Spectra covering 3650 < λ < 9350 Å are obtained with VIMOS on the ESO-VLT with integration times of 14h. Here we present the survey strategy, target selection, data processing, and the redshift measurement process with an emphasis on the specific methods used to adapt to this high-redshift range. We discuss the spectra quality and redshift reliability and derive a success rate in redshift measurement of 91%, or 74% by limiting the dataset to the most reliable measurements, down to a limiting magnitude i<SUB>AB</SUB> = 25. Measurements are performed all the way down to i<SUB>AB</SUB> = 27. The mean redshift of the main sample is z ~ 3 and extends over a broad redshift range mainly in 2 < z < 6. At 3 < z < 5, the galaxies cover a wide range of luminosities -23 < M<SUB>NUV</SUB> < -20.5, stellar mass 10<SUP>9</SUP>M<SUB>☉</SUB> < M<SUB>∗</SUB> < 10<SUP>11</SUP>M<SUB>☉</SUB>, and star formation rates 1M<SUB>☉</SUB>/yr < SFR < 10<SUP>3</SUP>M<SUB>☉</SUB>/yr. We discuss the spectral properties of galaxies using individual as well asstacked spectra. The comparison between spectroscopic and photometric redshifts as well as colour selection demonstrate the effectiveness of our selection scheme. From about ~ 90% of the data analysed so far, we expect to assemble >6000 galaxies with reliable spectroscopic redshifts in 2 < z < 6 when complete. This makes the VUDS the largest survey at these redshifts and offers the opportunity for unprecedented studies of the star-forming galaxy population and its distribution in large-scale structures during the main phase of galaxy assembly. Based on data obtained with the European Southern Observatory Very Large Telescope, Paranal, Chile, under Large Program 185.A-0791.Staged releases of the data will appear on http://cesam.lam.fr/vuds/, starting in mid-2015. | Acknowledgments: | We thank the ESO staff for their continuous support for the VUDS survey, particularly the Paranal staff, who conduct the observations, and Marina Rejkuba and the ESO user support group in Garching. This work is supported by funding from the European Research Council Advanced Grant ERC-2010-AdG-268107-EARLY and by INAF Grants PRIN 2010, PRIN 2012 and PICS 2013. A.C., O.C., M.T. and V.S. acknowledge the grant MIUR PRIN 2010–2011. D.M. gratefully acknowledges LAM hospitality during the initial phases of the project. This work is based on data products made available at the CESAM data center, Laboratoire d’Astrophysique de Marseille. This work partly uses 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 Sciences 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. | URI: | http://hdl.handle.net/20.500.12386/23502 | URL: | https://www.aanda.org/articles/aa/abs/2015/04/aa23829-14/aa23829-14.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201423829 | Bibcode ADS: | 2015A&A...576A..79L | Fulltext: | open |
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