Stellar Masses and SFRs for 1M Galaxies from SDSS and WISE
  We combine SDSS and WISE photometry for the full SDSS spectroscopic galaxy
sample, creating SEDs that cover lambda=0.4-22 micron for an unprecedented
large and comprehensive sample of 858,365 present-epoch galaxies. Using MAGPHYS
we then model simultaneously and consistently both the attenuated stellar SED
and the dust emission at 12 micron and 22 micron, producing robust new
calibrations for monochromatic mid-IR star formation rate proxies. These
modeling results provide the first mid-IR-based view of the bi-modality in star
formation activity among galaxies, exhibiting the sequence of star-forming
galaxies (main sequence) with a slope of dlogSFR/dlogM*=0.80 and a scatter of
0.39 dex. We find that these new star-formation rates along the SF main
sequence are systematically lower by a factor of 1.4 than those derived from
optical spectroscopy. We show that for most present-day galaxies the 0.4-22
micron SED fits can exquisitely predict the fluxes measured by Herschel at much
longer wavelengths. Our analysis also illustrates that the majorities of stars
in the present-day universe is formed in luminous galaxies (~L*) in and around
the green valley of the color-luminosity plane. We make the matched photometry
catalog and SED modeling results publicly available.
