The VVDS-VLA Deep Field - IV: Radio-optical properties
Abstract
(abridged) We use the 1.4 GHz VIMOS-VLA Deep Survey and the optical VVDS and the CFHT-LS to compare the properties of radio loud galaxies with respect to the whole population of optical galaxies. The availability of multiband photometry and high quality photometric redshifts allows to derive rest frame colors and radio luminosity functions down to a limit of a B rest-frame magnitude of M=-20. Galaxy properties and luminosity functions (LFs) are estimated up to z~1 for radio loud and radio quiet early and late type galaxies. Radio loud late type galaxies are redder than radio quiet objects of the same class and this is an effect related to the presence of more dust in stronger star forming galaxies. Moreover, we estimate optical LFs, stellar masses and star formation rate distributions for radio sources and compare them with those derived for a well defined control sample, finding that the probability for a galaxy to be a radio emitter significantly increases at high values of these parameters. Radio loud early type galaxies show luminosity evolution of their bivariate radio-optical LF, due to an evolution in the radio-optical ratio. The lack of evolution of the mass function of radio loud early type galaxies means that no new AGN are formed at z<1. On the contrary, radio loud late type objects show a strong evolution, both in luminosity and in density, of the radio LF for z>0.7. This evolution is the direct effect of the strong optical evolution of this class and no significant change with redshift of the radio-optical ratio is required. With the knowledge of the radio-optical ratio and the optical and radio LFs for late type galaxies, we estimated the star formation history of the Universe up to z~1.5, using optical galaxies as tracers of the global radio emission.
Cite
@article{arxiv.0811.1653,
title = {The VVDS-VLA Deep Field - IV: Radio-optical properties},
author = {S. Bardelli and E. Zucca and M. Bolzonella and P. Ciliegi and L. Gregorini and G. Zamorani and M. Bondi and A. Zanichelli and L. Tresse and D. Vergani and I. Gavignaud and A. Bongiorno and D. Bottini and B. Garilli and V. Le Brun and O. Le Fevre and D. Maccagni and R. Scaramella and M. Scodeggio and G. Vettolani and C. Adami and S. Arnouts and A. Cappi and S. Charlot and T. Contini and S. Foucaud and P. Franzetti and L. Guzzo and O. Ilbert and A. Iovino and F. Lamareille and H. J. McCracken and B. Marano and C. Marinoni and A. Mazure and B. Meneux and R. Merighi and S. Paltani and R. Pello` and A. Pollo and L. Pozzetti and M. Radovich and U. Abbas and J. Brinchmann and O. Cucciati and S. de la Torre and L. de Ravel and P. Memeo and E. Perez-Montero and Y. Mellier and P. Merluzzi and S. Temporin and H. R. De Ruiter and P. Parma},
journal= {arXiv preprint arXiv:0811.1653},
year = {2009}
}
Comments
17 pages, A&A in press