The star formation rate cookbook at 1 < z < 3: Extinction-corrected relations for UV and [OII]λ3727 luminosities
Journal
Date Issued
2015
Author(s)
Talia, M.
•
Cimatti, A.
•
•
Rodighiero, G.
•
•
Pozzi, F.
•
Daddi, E.
•
Maraston, C.
•
•
Kurk, J.
Description
We acknowledge the grants ASI n.I/023/12/0 “Attività relative alla fase B2/C per la missione Euclid” and MIUR PRIN 2010-2011 “The dark Universe and the cosmic evolution of baryons: from current surveys to Euclid”. We acknowledge the use of the software IRAF ( Tody 1993 ) in the spectroscopic analysis. M.T. would like to thank Gianni Zamorani for illuminating discussions on various aspects of the paper. The authors also thank the anonymous referee for very useful comments that helped to improve the clarity of the paper.
Abstract
Aims: In this paper we use a well-controlled spectroscopic sample of galaxies at 1 IR) and continuum reddening. Using Spitzer-MIPS and Herschel-PACS data we derive LIR for two-thirds of our sample. The LIR/LUV ratio is used as a probe of effective attenuation (AIRX) to search for correlations with continuum and spectroscopic features in order to derive empirical calibrations to correct UV and [OII]λ3727 luminosities for dust extinction. Results: Through the analyses of the correlations between different dust attenuation probes, a set of relations is provided that allows the recovery of the total unattenuated SFR for star-forming galaxies at 1 IRX and UV continuum slope (β) was tested for our sample and found to be broadly consistent with the literature results at the same redshift, though with a larger dispersion with respect to UV-selected samples. We find a correlation between the rest-frame equivalent width of the [OII]λ3727 line and β, which is the main result of this work. We therefore propose the rest-frame equivalent width of the [OII]λ3727 line as a dust attenuation probe and calibrate it through AIRX, though the assumption of a reddening curve is still needed to derive the actual attenuation towards the [OII]λ3727 line (A[OII]). We tested the issue of differential attenuation towards stellar continuum and nebular emission: our results are in line with the traditional prescription of extra attenuation towards nebular lines. Finally, we use our set of cross-calibrated SFR estimates to look at the relation between SFR and stellar mass. The galaxies in our sample show a close linear relation (σ = 0.3 dex) at all redshifts with a slope ~0.7-0.8, which confirms several previous results. Appendix A is available in electronic form at "http://www.aanda.org/10.1051/0004-6361/201425430/olm"
Volume
582
Start page
A80
Issn Identifier
0004-6361
Ads BibCode
2015A&A...582A..80T
Rights
open.access
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