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The Density Field of the 10k zCOSMOS Galaxies

Kovač, K. and Lilly, S. J. and Cucciati, O. and Porciani, C. and Iovino, A. and Zamorani, G. and Oesch, P. and Bolzonella, M. and Knobel, C. and Finoguenov, A. and Peng, Y. and Carollo, C. M. and Pozzetti, L. and Caputi, K. and Silverman, J. D. and Tasca, L. A. M. and Scodeggio, M. and Vergani, D. and Scoville, N. Z. and Capak, P. and Contini, T. and Kneib, J.-P. and Le Fèvre, O. and Mainieri, V. and Renzini, A. and Bardelli, S. and Bongiorno, A. and Coppa, G. and de la Torre, S. and de Ravel, L. and Franzetti, P. and Garilli, B. and Guzzo, L. and Kampczyk, P. and Lamareille, F. and Le Borgne, J. F. and Le Brun, V. and Maier, C. and Mignoli, M. and Pello, R. and Perez Montero, E. and Ricciardelli, E. and Tanaka, M. and Tresse, L. and Zucca, E. and Abbas, U. and Bottini, D. and Cappi, A. and Cassata, P. and Cimatti, A. and Fumana, M. and Koekemoer, A. M. and Maccagni, D. and Marinoni, C. and McCracken, H. J. and Memeo, P. and Meneux, B. and Scaramella, R. (2010) The Density Field of the 10k zCOSMOS Galaxies. Astrophysical Journal, 708 (1). pp. 505-533. ISSN 0004-637X. http://resolver.caltech.edu/CaltechAUTHORS:20100121-141126085

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Abstract

We use the current sample of ~10,000 zCOSMOS spectra of sources selected with I_(AB) < 22.5 to define the density field out to z ~ 1, with much greater resolution in the radial dimension than has been possible with either photometric redshifts or weak lensing. We present the new algorithm that we have developed (ZADE) to incorporate objects not yet observed spectroscopically by modifying their photometric redshift probability distributions using the spectroscopic redshifts of nearby galaxies. We present a number of tests on mock catalogs used to justify this approach. The ZADE algorithm allows us to probe a broader range of galaxy environments and reduce the Poisson noise in the density field. The reconstructed overdensity field of the 10k zCOSMOS galaxies consists of cluster-like patterns surrounded by void-like regions, extending up to z ~ 1. Some of these structures are very large, spanning the ~50 h^(–1) Mpc transverse direction of the COSMOS field and extending up to Δz ~ 0.05 in redshift. We present the three-dimensional overdensity maps and compare the reconstructed overdensity field to the independently identified virialized groups of galaxies and clusters detected in the visible and in X-rays. The distribution of the overdense structures is in general well traced by these virialized structures. A comparison of the large-scale structures in the zCOSMOS data and in the mock catalogs reveals an excellent agreement between the fractions of the volume enclosed in structures of all sizes above a given overdensity between the data and the mocks in 0.2 < z < 1, although in the data these overdense regions are in generally larger contiguous structures.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/708/1/505DOIUNSPECIFIED
http://www.iop.org/EJ/abstract/0004-637X/708/1/505/PublisherUNSPECIFIED
Additional Information:© 2010 American Astronomical Society. Print publication: Issue 1 (2010 January 1); received 2008 November 28; accepted for publication 2009 November 10; Published 2009 December 14. This work has been supported in part by a grant from the Swiss National Science Foundation and by grant ASI/COFIS/WP3110I/026/07/0. We thank M. G. Kitzbichler and S. D. M. White for providing themock catalogs (Kitzbichler & White 2007).
Group:COSMOS
Funders:
Funding AgencyGrant Number
Swiss National Science FoundationUNSPECIFIED
ASIASI/COFIS/WP3110I/026/07/0
Subject Keywords:galaxies: high-redshift; large-scale structure of universe; surveys
Record Number:CaltechAUTHORS:20100121-141126085
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20100121-141126085
Official Citation:The Density Field of the 10k zCOSMOS Galaxies K. Kovač, S. J. Lilly, O. Cucciati, C. Porciani, A. Iovino, G. Zamorani, P. Oesch, M. Bolzonella, C. Knobel, A. Finoguenov, Y. Peng, C. M. Carollo, L. Pozzetti, K. Caputi, J. D. Silverman, L. A. M. Tasca, M. Scodeggio, D. Vergani, N. Z. Scoville, P. Capak, T. Contini, J.-P. Kneib, O. Le Fèvre, V. Mainieri, A. Renzini, S. Bardelli, A. Bongiorno, G. Coppa, S. de la Torre, L. de Ravel, P. Franzetti, B. Garilli, L. Guzzo, P. Kampczyk, F. Lamareille, J.-F. Le Borgne, V. Le Brun, C. Maier, M. Mignoli, R. Pello, E. Perez Montero, E. Ricciardelli, M. Tanaka, L. Tresse, E. Zucca, U. Abbas, D. Bottini, A. Cappi, P. Cassata, A. Cimatti, M. Fumana, A. M. Koekemoer, D. Maccagni, C. Marinoni, H. J. McCracken, P. Memeo, B. Meneux, and R. Scaramella 2010 ApJ 708 505-533 doi: 10.1088/0004-637X/708/1/505
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:17273
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:25 Jan 2010 18:04
Last Modified:06 Jul 2015 20:36

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