Reddy, Naveen A. and Steidel, Charles C. and Pettini, Max and Adelberger, Kurt L. and Shapley, Alice E. and Erb, Dawn K. and Dickinson, Mark (2008) Multiwavelength constraints on the cosmic star formation history from spectroscopy: the rest-frame ultraviolet, Hα, and infrared luminosity functions at redshifts 1.9 ≾ z ≾ 3.4. Astrophysical Journal Supplement Series, 175 (1). pp. 48-85. ISSN 0067-0049 http://resolver.caltech.edu/CaltechAUTHORS:20090527-080644843
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We use a sample of rest-frame UV-selected and spectroscopically observed galaxies at redshifts 1.9 ≤ z < 3.4, combined with ground-based spectroscopic Hα and Spitzer MIPS 24 μm data, to derive the most robust measurements of the rest-frame UV, Hα, and infrared (IR) luminosity functions (LFs) at these redshifts. Our sample is by far the largest of its kind, with over 2000 spectroscopic redshifts in the range 1.9 ≤ z < 3.4 and ~15,000 photometric candidates in 29 independent fields covering a total area of almost a square degree. Our method for computing the LFs takes into account a number of systematic effects, including photometric scatter, Lyα line perturbations to the observed optical colors of galaxies, and contaminants. Taking into account the latter, we find no evidence for an excess of UV-bright galaxies over what was inferred in early z ~ 3 LBG studies. The UV LF appears to undergo little evolution between z ~ 4 and z ~ 2. Corrected for extinction, the UV luminosity density (LD) at z ~ 2 is at least as large as the value at z ~ 3 and a factor of ~9 larger than the value at z ~ 6, primarily reflecting an increase in the number density of bright galaxies between z ~ 6 and z ~ 2. Our analysis yields the first constraints anchored by extensive spectroscopy on the infrared and bolometric LFs for faint and moderately luminous (L_(bol) ≾ 10^(12) L⊙) galaxies. Adding the IR to the emergent UV luminosity, incorporating independent measurements of the LD from ULIRGs, and assuming realistic dust attenuation values for UV-faint galaxies, indicates that galaxies with L_(bol) < 10^(12) L⊙ account for ≈80% of the bolometric LD and SFRD at z ~ 2–3. This suggests that previous estimates of the faint end of the Lbol LF may have underestimated the steepness of the faint-end slope at L_(bol) < 10^(12) L⊙. Our multiwavelength constraints on the global SFRD indicate that approximately one-third of the present-day stellar mass density was formed in subultraluminous galaxies between redshifts z = 1.9–3.4.
|Additional Information:||© 2008 The American Astronomical Society. Print publication: Issue 1 (2008 March). Received 2007 May 21, accepted for publication 2007 June 16. We acknowledge useful conversations with Rychard Bouwens, Emeric Le Floc’h,Casey Papovich, Marcin Sawicki, and Lin Yan. We thank Emeric Le Floc’h for providing data from Le Floc’h et al. (2005) in electronic format, Rychard Bouwens for a careful reading of the manuscript, and the referee for helpful suggestions to improve the clarity of the paper. This work would not have been possible without the support of the staff of the Keck Observatory. The work presented here has been supported by grants AST 03- 07263 and AST 06-06912 from the National Science Foundation and by the David and Lucile Packard Foundation.|
|Subject Keywords:||galaxies: evolution; galaxies: formation; galaxies: high-redshift; galaxies: luminosity function, mass function; galaxies: starburst; infrared: galaxies|
|Official Citation:||Multiwavelength Constraints on the Cosmic Star Formation History from Spectroscopy: The Rest-Frame Ultraviolet, Hα, and Infrared Luminosity Functions at Redshifts 1.9 ≾ z ≾ 3.4 Naveen A. Reddy, Charles C. Steidel, Max Pettini, Kurt L. Adelberger, Alice E. Shapley, Dawn K. Erb, and Mark Dickinson 2008 ApJS 175 48-85 doi: 10.1086/521105|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||28 Aug 2009 23:27|
|Last Modified:||26 Dec 2012 11:01|
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