Bardelli, S. and Schinnerer, E. and Smolčić, V. and Zamorani, G. and Zucca, E. and Mignoli, M. and Halliday, C. and Kovač, K. and Ciliegi, P. and Caputi, K. and Koekemoer, A. M. and Bongiorno, A. and Bondi, M. and Bolzonella, M. and Vergani, D. and Pozzetti, L. and Carollo, C. M. and Contini, T. and Kneib, J.-P. and LeFèvre, O. and Lilly, S. and Mainieri, V. and Renzini, A. and Scodeggio, M. and Coppa, G. and Cucciati, O. and de-la-Torre, S. and de-Ravel, L. and Franzetti, P. and Garilli, B. and Iovino, A. and Kampczyk, P. and Knobel, C. and Lamareille, F. and Le Borgne, J.-F. and Le Brun, V. and Maier, C. and Pellò, R. and Peng, Y. and Perez-Montero, E. and Ricciardelli, E. and Silverman, J. D. and Tanaka, M. and Tasca, L. and Tresse, L. and Abbas, U. and Bottini, D. and Cappi, A. and Cassata, P. and Cimatti, A. and Guzzo, L. and Leauthaud, A. and Maccagni, D. and Marinoni, C. and McCracken, H. J. and Memeo, P. and Meneux, B. and Oesch, P. and Porciani, C. and Scaramella, R. and Capak, P. and Sanders, D. and Scoville, N. and Taniguchi, Y. and Jahnke, K. (2010) Properties and environment of radio-emitting galaxies in the VLA-zCOSMOS survey. Astronomy and Astrophysics, 511 . Art. No. A1. ISSN 0004-6361 http://resolver.caltech.edu/CaltechAUTHORS:20100416-132658729
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Aims. We investigate the properties and the environment of radio sources with optical counterparts from the combined VLA-COSMOS and zCOSMOS samples. The advantage of this sample is the availability of optical spectroscopic informations, high quality redshifts, and accurate density determination. Methods. By comparing the star formation rates estimated from the optical spectral energy distribution with those based on the radio luminosity, we divide the radio sources in to three families passive AGN, non-passive AGN, and star-forming galaxies. These families occupy specific regions of the 8.0−4.5 μm infrared color- specific star-formation plane, from which we extract the corresponding control samples. Results. Only the passive AGN have a significantly different environmental distribution from their control sample. The fraction of radio-loud passive AGN increases from ~2% in underdense regions to ~15% for overdensities (1 + δ) greater than 10. This trend is also present as a function of richness of the groups hosting the radio sources. Passive AGN in overdensities tend to have higher radio luminosities than those in lower density environments. Since the black hole mass distribution is similar in both environments, we speculate that, for low radio luminosities, the radio emission is controlled (by fuel availability or confinement of the radio jet by local gas pressure) by the interstellar medium of the host galaxy, while in other cases it is determined by the structure (group or cluster) in which the galaxy resides.
|Additional Information:||© ESO 2010. Received 1 July 2009. Accepted 22 October 2009. We acknowledge support from an INAF contract PRIN- 2007/1.06.10.08 and an ASI grant ASI/COFIS/WP3110 I/026/07/0.The VLA is operated by the National Radio Astronomy Observatory, which is a facility of the National Science Foundation, operated under cooperative agreement by Associated Universities, IIlC.|
|Subject Keywords:||galaxies: fundamental parameters galaxies: general galaxies: luminosity function, mass function radio continuum: galaxies radio continuum: planetary systems|
|Official Citation:||Properties and environment of radio-emitting galaxies in the VLA-zCOSMOS survey S. Bardelli, E. Schinnerer, V. Smolic, G. Zamorani, E. Zucca, M. Mignoli, C. Halliday, K. Kova, P. Ciliegi, K. Caputi, A. M. Koekemoer, A. Bongiorno, M. Bondi, M. Bolzonella, D. Vergani, L. Pozzetti, C. M. Carollo, T. Contini, J.-P. Kneib, O. Le Fèvre, S. Lilly, V. Mainieri, A. Renzini, M. Scodeggio, G. Coppa, O. Cucciati, S. de la Torre, L. de Ravel, P. Franzetti, B. Garilli, A. Iovino, P. Kampczyk, C. Knobel, F. Lamareille, J.-F. Le Borgne, V. Le Brun, C. Maier, R. Pellò, Y. Peng, E. Perez-Montero, E. Ricciardelli, J. D. Silverman, M. Tanaka, L. Tasca, L. Tresse, U. Abbas, D. Bottini, A. Cappi, P. Cassata, A. Cimatti, L. Guzzo, A. Leauthaud, D. Maccagni, C. Marinoni, H. J. McCracken, P. Memeo, B. Meneux, P. Oesch, C. Porciani, R. Scaramella, P. Capak, D. Sanders, N. Scoville, Y. Taniguchi and K. Jahnke A&A 511 A1 (2010) DOI: 10.1051/0004-6361/200912809|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||19 Apr 2010 15:39|
|Last Modified:||26 Dec 2012 11:58|
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