Dust correction factors over in massive star-forming galaxies from stacking in \emph{Herschel}
arXiv:1409.2093 · doi:10.1051/0004-6361/201424607
Abstract
In this work we use stacking analysis in \emph{Herschel} PACS to study the accuracy of several dust-correction factors typically employed to estimate total star-formation rate (SFR) of high-redshift star-forming (SF) galaxies. We also analyze what stacking suggests about the relation between SFR and stellar mass and the redshift evolution of the specific SFR (). We find that the dust properties of massive SF galaxies evolve with redshift, being galaxies at more attenuated than at for a given UV continuum slope and stellar mass. As a consequence, a single IRX- relation can not be used to recover the total SFR of massive SF galaxies at . This might have implications for higher redshift studies, where a single IRX- relation derived for local starburst is usually assumed to be valid. However, we find that the local relation between dust attenuation and stellar mass is valid at least up to , although deviations are found for higher redshift galaxies where only galaxies are detected through stacking. This, therefore, does not rule out the possibility that the local dust-mass relation can be valid for less massive SF galaxies at . The SED fitting procedure with stellar population templates gives over-estimated values (about 0.3--0.5 dex in ) of the dust-corrected SFR at all redshifts studied here. We find that the slope of the main-sequence of star formation is less steep than previously found in massive galaxies with , and the redshift evolution of the sSFR reported in previous works in massive is well recovered.
arXiv commentAccepted for publication in A&A
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