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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 730316.0, MPI für Astronomie / Publikationen_mpia
Stellar masses and star formation rates for 1M galaxies from SDSS+WISE
Authors:Chang, Y.-Y.; van der Wel, A.; da Cunha, E.; Rix, H.-W.
Date of Publication (YYYY-MM-DD):2015
Title of Journal:The Astrophysical Journal Supplement Series
Issue / Number:1
Start Page:id. 8 (16 pp)
Audience:Not Specified
Abstract / Description:We combine Sloan Digitital Sky Survey (SDSS) and WISE photometry for the full SDSS spectroscopic galaxy sample, creating spectral energy distributions (SEDs) that cover λ = 0.4–22 μm 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 μm, 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 star-forming 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 μm 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 (∼ {L}*) in and around the “green valley” of the color–luminosity plane. We make publicly available the matched photometry catalog and SED modeling results.
Free Keywords:catalogs; galaxies: star formation; galaxies: statistics; galaxies: stellar content; infrared: galaxies
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0067-0049 %R 10.1088/0067-0049/219/1/8
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