Rodighiero, G. and Vaccari, M. and Franceschini, A. and Tresse, L. and Le Fevre, O. and Le Brun, V. and Mancini, C. and Matute, I. and Cimatti, A. and Marchetti, L. and Ilbert, O. and Arnouts, S. and Bolzonella, M. and Zucca, E. and Bardelli, S. and Lonsdale, C. J. and Shupe, D. and Surace, J. and Rowan-Robinson, M. and Garilli, B. and Zamorani, G. and Pozzetti, L. and Bondi, M. and de la Torre, S. and Vergani, D. and Santini, P. and Grazian, A. and Fontana, A. (2010) Mid- and far-infrared luminosity functions and galaxy evolution from multiwavelength Spitzer observations up to z ~ 2.5. Astronomy and Astrophysics, 515 . A8. ISSN 0004-6361 http://resolver.caltech.edu/CaltechAUTHORS:20100628-100933554
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Context. Studies of the infrared (IR) emission of cosmic sources have proven essential to constraining the evolutionary history of cosmic star formation and the gravitational accretion of nuclear black holes, because many of these events occur inside heavily dust-extinguished environments. Aims. The Spitzer Space Telescope has provided a large amount of data to constrain the nature and cosmological evolution of infrared source populations. In the present paper we exploit a large homogeneous dataset to derive a self-consistent picture of IR emission based on the time-dependent λ_(eff) = 24, 15, 12, and 8 μm monochromatic and bolometric IR luminosity functions (LF) over the full 0 < z < 2.5 redshift range. Methods. Our present analysis is based on a combination of data from deep Spitzer surveys of the VIMOS VLT Deep Survey (VVDS-SWIRE) and GOODS fields. To our limiting flux of S_(24) = 400 μJy, our sample derived from VVDS-SWIRE includes 1494 sources, and 666 and 904 sources brighter than S_(24) = 80 μJy are catalogued in GOODS-S and GOODS-N, respectively, for a total area of ~0.9 square degrees. Apart from a few galaxies, we obtain reliable optical identifications and redshifts for all these sources, providing a rich and robust dataset for our luminosity function determination. The final combined reliable sample includes 3029 sources, the fraction with photometric redshifts being 72% over all redshifts and almost all galaxies at z > 1.5. Based on the multiwavelength information available in these areas, we constrain the LFs at 8, 12, 15, and 24 μm. We also infer the total IR luminosities from our best-fit model of the observed SEDs of each source, and use this to derive the bolometric (8–1000 μm) LF and comoving volume emissivity to z ~ 2.5. Results. In the redshift interval 0 < z < 1, the bolometric IR luminosity density evolves as (1 + z)^(3.8±0.4). Although it is more uncertain at higher-z, our results show a flattening in the IR luminosity density at z > 1. The mean redshift of the peak in the source number density shifts with luminosity: the brightest IR galaxies appear to form stars at earlier cosmic times (z > 1.5), while star formation in the less luminous galaxies continues until more recent epochs (z ~ 1 for L_(IR) < 10^(11)_☉), in overall agreement with similar analyses in the literature. Conclusions. Our results are indicative of a rapid increase in the galaxy IR comoving volume emissivity up to z ~ 1 and a constant average emissivity at z > 1. We also appear to measure a difference in the evolutionary rate of the source number densities as a function of luminosity, which is consistent with the downsizing evolutionary patterns reported for other samples of cosmic sources.
|Additional Information:||© 2010 ESO. Received 13 March 2009; accepted 21 November 2009. Part of this work was supported by the Italian Space Agency under contract ASI/INAF I/005/07/0 Herschel Fase E and under contract ASI/I/016/07/0. It is partly based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. This research has been developed within the framework of the VVDS consortium. This work has been partially supported by the CNRS-INSU and its Programme National de Cosmologie (France), and by Italian Ministry (MIUR) grants COFIN2000 (MM02037133) and COFIN2003 (num.2003020150) and by INAF grants (PRIN-INAF 2005). The VLT-VIMOS observations have been carried out on guaranteed time (GTO) allocated by the European Southern Observatory (ESO) to the VIRMOS consortium, under a contractual agreement between the Centre National de la Recherche Scientifique of France, heading a consortium of French and Italian institutes, and ESO, to design, manufacture and test the VIMOS instrument. Based on observations collected at the European Southern Observatory Very Large Telescope, Paranal, Chile, program 070.A-9007(A), and on data obtained at the Canada-France-Hawaii Telescope, operated by the Institut National des Sciences de l’Univers of the Centre National de la Recherche Scientifique of France, the National Research Council of Canada, and the University of Hawaii. Based on 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 Science 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. We warmly thank P. Perez-Gonzalez for useful discussion and for reading our work, Bob Mann for his advice and for his contribution to the ELAIS/IDL software which provided the basis for the likelihood & reliability analysis. We also thank F. Pozzi for providing her 15 μm luminosity function in electronic format and C. Gruppioni for useful comments. We are finally grateful to the referee for his/her comments and suggestions that improved the presentation of the paper.|
|Subject Keywords:||galaxies: evolution; galaxies: fundamental parameters; galaxies: luminosity function, mass function; infrared: galaxies; cosmology: observations; surveys|
|Official Citation:||Mid- and far-infrared luminosity functions and galaxy evolution from multiwavelength Spitzer observations up to z ~ 2.5 G. Rodighiero, M. Vaccari, A. Franceschini, L. Tresse, O. Le Fevre, V. Le Brun, C. Mancini, I. Matute, A. Cimatti, L. Marchetti, O. Ilbert, S. Arnouts, M. Bolzonella, E. Zucca, S. Bardelli, C. J. Lonsdale, D. Shupe, J. Surace, M. Rowan-Robinson, B. Garilli, G. Zamorani, L. Pozzetti, M. Bondi, S. de la Torre, D. Vergani, P. Santini, A. Grazian and A. Fontana A&A 515 A8 (2010) DOI: 10.1051/0004-6361/200912058|
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|Deposited By:||Jason Perez|
|Deposited On:||28 Jun 2010 18:28|
|Last Modified:||26 Dec 2012 12:10|
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