Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 457, Issue 3, Pages 2703-2721Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stw096
Keywords
surveys; galaxies: active; galaxies: fundamental parameters; infrared: galaxies; galaxies: star formation
Categories
Funding
- Science and Technology Facilities Council [ST/L00075X/1]
- NASA through Hubble Fellowship by Space Telescope Science Institute [51330]
- NASA [NAS 5-26555]
- Alfred P. Sloan Foundation
- National Science Foundation
- U.S. Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- NASA Office of Space Science [NNX09AF08G]
- STFC [ST/L00075X/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/L00075X/1] Funding Source: researchfish
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We study a set of 3319 galaxies in the redshift interval 0.04 < z < 0.15 with far-infrared (FIR) coverage from the Herschel Stripe 82 survey (HerS), and emission-line measurements, redshifts, stellar masses and star formation rates (SFRs) from the Sloan Digital Sky Survey (SDSS) (DR7) MPA/JHU data base. About 40 per cent of the sample are detected in the Herschel/SPIRE 250 p.m band. Total infrared (TIR) luminosities derived from HerS and Wide field Infrared Survey Explorer (WISE) photometry allow us to compare infrared and optical estimates of SFR with unprecedented statistics for diverse classes of galaxies. We find excellent agreement between TIR-derived and emission line-based SFRs for H II galaxies. Other classes, such as active galaxies and evolved galaxies, exhibit systematic discrepancies between optical and TIR SFRs. We demonstrate that these offsets are attributable primarily to survey biases and the large intrinsic uncertainties of the D,4000- and colour -based optical calibrations used to estimate the SDSS SFRs of these galaxies. Using a classification scheme which expands upon popular emission -line methods, we demonstrate that emission -line galaxies with uncertain classifications include a population of massive, dusty, metal -rich star-forming systems that are frequently neglected in existing studies. We also study the capabilities of infrared selection of star-forming galaxies. FIR selection reveals a substantial population of galaxies dominated by cold dust which are missed by the long-wavelength WISE bands. Our results demonstrate that Herschel large-area surveys offer the means to construct large, relatively complete samples of local star-forming galaxies with accurate estimates of SFR that can be used to study the interplay between nuclear activity and star formation.
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