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The zCOSMOS 10k-Bright Spectroscopic Sample

Lilly, Simon J. and Le Brun, Vincent and Maier, Christian and Mainieri, Vincenzo and Mignoli, Marco and Scodeggio, Marco and Zamorani, Gianni and Carollo, Marcella C. and Contini, Thierry and Kneib, Jean-Paul and Le Fèvre, Olivier and Renzini, Alvio and Bardelli, Sandro and Bolzonella, Micol and Bongiorno, Angela and Caputi, Karina and Coppa, Graziano and Cucciati, Olga and de la Torre, Sylvain and de Ravel, Loic and Franzetti, Paolo and Garilli, Bianca and Iovino, Angela and Kampczyk, Pawel and Kovač, Katarina and Knobel, Christian and Lamareille, Fabrice and Le Borgne, Jean-Francois and Pellò, Roser and Peng, Yingjie and Pérez-Montero, Enrique and Ricciardelli, Elena and Silverman, John D. and Tanaka, Masayuki and Tasca, Lidia and Tresse, Laurence and Vergani, Daniela and Zucca, Elena and Ilbert, Olivier and Salvato, Mara and Oesch, Pascal A. and Abbas, Umi and Bottini, Dario and Capak, Peter and Cappi, Alberto and Cassata, Paolo and Cimatti, Andrea and Elvis, Martin and Fumana, Marco and Guzzo, Luigi and Hasinger, Günther and Koekemoer, Anton and Leauthaud, Alexei and Maccagni, Dario and Marinoni, Christian and McCracken, Henry and Memeo, Pierdomenico and Meneux, Baptiste and Porciani, Cristiano and Pozzetti, Lucia and Sanders, David and Scaramella, Roberto and Scarlata, Claudia and Scoville, Nick and Shopbell, Patrick and Taniguchi, Yoshiaki (2009) The zCOSMOS 10k-Bright Spectroscopic Sample. Astrophysical Journal Supplement Series, 184 (2). pp. 218-229. ISSN 0067-0049. doi:10.1088/0067-0049/184/2/218.

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We present spectroscopic redshifts of a large sample of galaxies with I_(AB) < 22.5 in the COSMOS field, measured from spectra of 10,644 objects that have been obtained in the first two years of observations in the zCOSMOS-bright redshift survey. These include a statistically complete subset of 10,109 objects. The average accuracy of individual redshifts is 110 km s^(–1), independent of redshift. The reliability of individual redshifts is described by a Confidence Class that has been empirically calibrated through repeat spectroscopic observations of over 600 galaxies. There is very good agreement between spectroscopic and photometric redshifts for the most secure Confidence Classes. For the less secure Confidence Classes, there is a good correspondence between the fraction of objects with a consistent photometric redshift and the spectroscopic repeatability, suggesting that the photometric redshifts can be used to indicate which of the less secure spectroscopic redshifts are likely right and which are probably wrong, and to give an indication of the nature of objects for which we failed to determine a redshift. Using this approach, we can construct a spectroscopic sample that is 99% reliable and which is 88% complete in the sample as a whole, and 95% complete in the redshift range 0.5 < z < 0.8. The luminosity and mass completeness levels of the zCOSMOS-bright sample of galaxies is also discussed.

Item Type:Article
Related URLs:
URLURL TypeDescription DOIArticle
Lilly, Simon J.0000-0002-6423-3597
Carollo, Marcella C.0000-0003-1624-7609
Kneib, Jean-Paul0000-0002-4616-4989
Le Fèvre, Olivier0000-0001-5891-2596
Renzini, Alvio0000-0002-7093-7355
Caputi, Karina0000-0001-8183-1460
Cucciati, Olga0000-0002-9336-7551
de la Torre, Sylvain0000-0002-0839-2884
Silverman, John D.0000-0002-0000-6977
Tanaka, Masayuki0000-0002-5011-5178
Ilbert, Olivier0000-0002-7303-4397
Salvato, Mara0000-0001-7116-9303
Oesch, Pascal A.0000-0001-5851-6649
Capak, Peter0000-0003-3578-6843
Hasinger, Günther0000-0002-0797-0646
Koekemoer, Anton0000-0002-6610-2048
Leauthaud, Alexei0000-0002-3677-3617
McCracken, Henry0000-0002-9489-7765
Sanders, David0000-0002-1233-9998
Scarlata, Claudia0000-0002-9136-8876
Scoville, Nick0000-0002-0438-3323
Taniguchi, Yoshiaki0000-0003-2247-3741
Additional Information:© 2009 The American Astronomical Society. Received 2009 March 19; accepted 2009 August 21; published 2009 September 15. Efficient execution of such a large program in Service Mode on the VLT requires the efforts of many individual observatory staff at ESO, both in Garching and on Cerro Paranal, and we gratefully acknowledge the contribution of these many and regrettably sometimes anonymous individuals to our project. The zCOSMOS program builds on many of the hardware and software tools built by the VIMOS/VVDS team, and we acknowledge here the contribution of those in the VIMOS/ VVDS team who are not part of the zCOSMOS project. Finally, we acknowledge with appreciation the contributions of those many individuals not listed as authors who have worked, directly or indirectly, to produce the superb imaging data on which the COSMOS survey is based.
Group:COSMOS, Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
European Southern Observatory (ESO) Very Large Telescope (VLT)175
NASANAS 5-26555
National Astronomical Observatory of JapanUNSPECIFIED
National Research Council of CanadaUNSPECIFIED
Subject Keywords:cosmology: observations; galaxies: active; galaxies: distances and redshifts; galaxies: evolution; large-scale structure of universe; quasars: general; surveys
Issue or Number:2
Record Number:CaltechAUTHORS:20091021-080927611
Persistent URL:
Official Citation:The zCOSMOS 10k-Bright Spectroscopic Sample Simon J. Lilly, Vincent Le Brun, Christian Maier, Vincenzo Mainieri, Marco Mignoli, Marco Scodeggio, Gianni Zamorani, Marcella Carollo, Thierry Contini, Jean-Paul Kneib, Olivier Le Fèvre, Alvio Renzini, Sandro Bardelli, Micol Bolzonella, Angela Bongiorno, Karina Caputi, Graziano Coppa, Olga Cucciati, Sylvain de la Torre, Loic de Ravel, Paolo Franzetti, Bianca Garilli, Angela Iovino, Pawel Kampczyk, Katarina Kovac, Christian Knobel, Fabrice Lamareille, Jean-Francois Le Borgne, Roser Pello, Yingjie Peng, Enrique Pérez-Montero, Elena Ricciardelli, John D. Silverman, Masayuki Tanaka, Lidia Tasca, Laurence Tresse, Daniela Vergani, Elena Zucca, Olivier Ilbert, Mara Salvato, Pascal Oesch, Umi Abbas, Dario Bottini, Peter Capak, Alberto Cappi, Paolo Cassata, Andrea Cimatti, Martin Elvis, Marco Fumana, Luigi Guzzo, Gunther Hasinger, Anton Koekemoer, Alexei Leauthaud, Dario Maccagni, Christian Marinoni, Henry McCracken, Pierdomenico Memeo, Baptiste Meneux, Cristiano Porciani, Lucia Pozzetti, David Sanders, Roberto Scaramella, Claudia Scarlata, Nick Scoville, Patrick Shopbell, and Yoshiaki Taniguchi 2009 ApJS 184 218-229 doi: 10.1088/0067-0049/184/2/218
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:16417
Deposited By: Tony Diaz
Deposited On:26 Oct 2009 18:27
Last Modified:08 Nov 2021 23:26

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