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Stellar masses and star formation rates for 1 M galaxies from SDSS+WISE

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Abstract
We combine Sloan Digitital Sky Survey (SDSS) and WISE photometry for the full SDSS spectroscopic galaxy sample, creating spectral energy distributions (SEDs) that cover lambda = 0.4-22 mu m for an unprecedentedly large and comprehensive sample of 858,365 present-epoch galaxies. Using MAGPHYS, we then simultaneously and consistently model both the attenuated stellar SED and the dust emission at 12 and 22 mu m, producing robust new calibrations for monochromatic mid-IR star formation rate (SFR) proxies. These modeling results provide the first mid-IR-based view of the bimodality in star formation activity among galaxies, exhibiting the sequence of starforming galaxies ("main sequence") with a slope of d log SFR/d log M-* = 0.80 and a scatter of 0.39 dex. We find that these new SFRs 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 mu m SED fits can exquisitely predict the fluxes measured by Herschel at much longer wavelengths. Our analysis also illustrates that the majority of stars in the present-day universe are formed in luminous galaxies (similar to L*) in and around the "green valley" of the color-luminosity plane. We make publicly available the matched photometry catalog and SED modeling results.
Keywords
DIGITAL SKY SURVEY, SCIENCE DEMONSTRATION PHASE, HERSCHEL-ATLAS, ASSEMBLY GAMA, FORMING GALAXIES, MIDINFRARED PROPERTIES, PHYSICAL-PROPERTIES, DATA RELEASE, SIMPLE-MODEL, IMAGES. II., catalogs, galaxies: star formation, galaxies: statistics, galaxies: stellar content, infrared: galaxies, Supporting material:, machine-readable tables

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Chicago
Chang, Yu-Yen, Arjen van der Wel, Elisabete da Cunha, and Hans-Walter Rix. 2015. “Stellar Masses and Star Formation Rates for 1 M Galaxies from SDSS+WISE.” Astrophysical Journal Supplement Series 219 (1).
APA
Chang, Y.-Y., van der Wel, A., da Cunha, E., & Rix, H.-W. (2015). Stellar masses and star formation rates for 1 M galaxies from SDSS+WISE. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 219(1).
Vancouver
1.
Chang Y-Y, van der Wel A, da Cunha E, Rix H-W. Stellar masses and star formation rates for 1 M galaxies from SDSS+WISE. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES. 2015;219(1).
MLA
Chang, Yu-Yen et al. “Stellar Masses and Star Formation Rates for 1 M Galaxies from SDSS+WISE.” ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 219.1 (2015): n. pag. Print.
@article{8567803,
  abstract     = {We combine Sloan Digitital Sky Survey (SDSS) and WISE photometry for the full SDSS spectroscopic galaxy sample, creating spectral energy distributions (SEDs) that cover lambda = 0.4-22 mu m for an unprecedentedly large and comprehensive sample of 858,365 present-epoch galaxies. Using MAGPHYS, we then simultaneously and consistently model both the attenuated stellar SED and the dust emission at 12 and 22 mu m, producing robust new calibrations for monochromatic mid-IR star formation rate (SFR) proxies. These modeling results provide the first mid-IR-based view of the bimodality in star formation activity among galaxies, exhibiting the sequence of starforming galaxies ({\textacutedbl}main sequence{\textacutedbl}) with a slope of d log SFR/d log M-* = 0.80 and a scatter of 0.39 dex. We find that these new SFRs 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 mu m SED fits can exquisitely predict the fluxes measured by Herschel at much longer wavelengths. Our analysis also illustrates that the majority of stars in the present-day universe are formed in luminous galaxies (similar to L*) in and around the {\textacutedbl}green valley{\textacutedbl} of the color-luminosity plane. We make publicly available the matched photometry catalog and SED modeling results.},
  articleno    = {8},
  author       = {Chang, Yu-Yen and van der Wel, Arjen and da Cunha, Elisabete and Rix, Hans-Walter},
  issn         = {0067-0049},
  journal      = {ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES},
  language     = {eng},
  number       = {1},
  pages        = {16},
  title        = {Stellar masses and star formation rates for 1 M galaxies from SDSS+WISE},
  url          = {http://dx.doi.org/10.1088/0067-0049/219/1/8},
  volume       = {219},
  year         = {2015},
}

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