Caputi, K. I. and Lagache, G. and Yan, Lin and Dole, H. and Bavouzet, N. and Le Floc'h, E. and Choi, P. I. and Helou, G. and Reddy, N. (2007) The Infrared Luminosity Function of Galaxies at Redshifts z = 1 and z ~ 2 in the GOODS Fields. Astrophysical Journal, 660 (1). pp. 97-116. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20091027-144736801
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We present the rest-frame 8 µm LF at redshifts z = 1 and ~ 2, computed from Spitzer 24 µm–selected galaxies in the GOODS fields over an area of 291 arcmin^2. Using classification criteria based on X-ray data and IRAC colors, we identify the AGNs in our sample. The rest-frame 8 µm LFs for star-forming galaxies at redshifts z = 1 and ~ 2 have the same shape as at z ~ 0, but with a strong positive luminosity evolution. The number density of star-forming galaxies with log_(10)(vL^8_v^(µm)) > 11 increases by a factor >250 from redshift z ~ 0 to 1 and is basically the same at z = 1 and ~ 2. The resulting rest-frame 8 µm luminosity densities associated with star formation at z = 1 and ~ 2 are more than 4 and 2 times larger than at z ~ 0, respectively. We also compute the total rest-frame 8 µm LF for star-forming galaxies and AGNs at z ~ 2 and show that AGNs dominate its bright end, which is well described by a power law. Using a new calibration based on Spitzer star-forming galaxies at 0 < z < 0.6 and validated at higher redshifts through stacking analysis, we compute the bolometric IR LF for star-forming galaxies at z = 1 and ~ 2. We find that the respective bolometric IR luminosity densities are (1.2 ± 0.2) × 10^9 and (6.6^(+1.2)_(-1.0)) × 10^8 L_⊙ Mpc^(-3), in agreement with previous studies within the error bars. At z ~ 2, around 90% of the IR luminosity density associated with star formation is produced by luminous and ultraluminous IR galaxies, with the two populations contributing in roughly similar amounts. Finally, we discuss the consistency of our findings with other existing observational results on galaxy evolution.
|Additional Information:||© 2007 The American Astronomical Society. Received 2006 October 11; accepted 2007 January 8. This paper is based on observations made with the Spitzer Observatory, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under NASA contract 1407. Also based on observations made with the Advanced Camera for Surveys on board the Hubble Space Telescope operated by NASA/ ESA and with the Infrared Spectrometer and Array Camera on the ‘‘Antu’’ Very Large Telescope operated by the European Southern Observatory in Cerro Paranal, Chile, and which form part of the publicly available GOODS data sets. We thank the GOODS teams for providing reduced data products. We are grateful to He´ctor Flores and Francois Hammer, for providing us additional spectroscopic redshifts for the GOODS/ CDF-S; Jiasheng Huang, for sending us the results of his 8 m LF at z 0 before publication; and Dieter Lutz and Pablo Perez-Gonzalez, for providing us with some of their published results in electronic format.We thank the anonymous referee for helpful comments and suggestions. K. I. C. and G. L. thank the Infrared Processing and Analysis Center (IPAC) at Caltech for hospitality while part of this work was being done. K. I. C. acknowledges CNES and CNRS funding.|
|Subject Keywords:||galaxies: evolution; galaxies: high-redshift; galaxies: luminosity function, mass function; infrared: galaxies|
|Official Citation:||The Infrared Luminosity Function of Galaxies at Redshifts z = 1 and z ~ 2 in the GOODS Fields K. I. Caputi, G. Lagache, Lin Yan, H. Dole, N. Bavouzet, E. Le Floc'h, P. I. Choi, G. Helou, and N. Reddy 2007 ApJ 660 97-116 doi: 10.1086/512667|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||30 Oct 2009 17:06|
|Last Modified:||26 Dec 2012 11:30|
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