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Title:
New Constraints on the Star Formation Histories and Dust Attenuation of Galaxies in the Local Universe from GALEX
Authors:
Salim, Samir; Charlot, Stéphane; Rich, R. Michael; Kauffmann, Guinevere; Heckman, Timothy M.; Barlow, Tom A.; Bianchi, Luciana; Byun, Yong-Ik; Donas, Jose; Forster, Karl; Friedman, Peter G.; Jelinsky, Patrick N.; Lee, Young-Wook; Madore, Barry F.; Malina, Roger F.; Martin, D. Christopher; Milliard, Bruno; Morrissey, Patrick; Neff, Susan G.; Schiminovich, David; Seibert, Mark; Siegmund, Oswald H. W.; Small, Todd; Szalay, Alex S.; Welsh, Barry Y.; Wyder, Ted K.
Affiliation:
AA(Department of Physics and Astronomy, University of California, Los Angeles, CA 90095; .), AB(Max-Planck Institut für Astrophysik, D-85748 Garching, Germany.; Institut d'Astrophysique de Paris, CNRS, 98 bis boulevard Arago, F-75014 Paris, France.), AC(Department of Physics and Astronomy, University of California, Los Angeles, CA 90095; .), AD(Max-Planck Institut für Astrophysik, D-85748 Garching, Germany.), AE(Department of Physics and Astronomy, Johns Hopkins University, Homewood Campus, Baltimore, MD 21218.), AF(California Institute of Technology, MC 405-47, 1200 East California Boulevard, Pasadena, CA 91125.), AG(Center for Astrophysical Sciences, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218.), AH(Center for Space Astrophysics, Yonsei University, Seoul 120-749, Korea.), AI(Laboratoire d'Astrophysique de Marseille, BP 8, Traverse du Siphon, 13376 Marseille Cedex 12, France.), AJ(California Institute of Technology, MC 405-47, 1200 East California Boulevard, Pasadena, CA 91125.), AK(California Institute of Technology, MC 405-47, 1200 East California Boulevard, Pasadena, CA 91125.), AL(Space Sciences Laboratory, University of California at Berkeley, 601 Campbell Hall, Berkeley, CA 94720.), AM(Center for Space Astrophysics, Yonsei University, Seoul 120-749, Korea.), AN(Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101.), AO(Laboratoire d'Astrophysique de Marseille, BP 8, Traverse du Siphon, 13376 Marseille Cedex 12, France.), AP(California Institute of Technology, MC 405-47, 1200 East California Boulevard, Pasadena, CA 91125.), AQ(Laboratoire d'Astrophysique de Marseille, BP 8, Traverse du Siphon, 13376 Marseille Cedex 12, France.), AR(California Institute of Technology, MC 405-47, 1200 East California Boulevard, Pasadena, CA 91125.), AS(Laboratory for Astronomy and Solar Physics, NASA Goddard Space Flight Center, Greenbelt, MD 20771.), AT(California Institute of Technology, MC 405-47, 1200 East California Boulevard, Pasadena, CA 91125.), AU(California Institute of Technology, MC 405-47, 1200 East California Boulevard, Pasadena, CA 91125.), AV(Space Sciences Laboratory, University of California at Berkeley, 601 Campbell Hall, Berkeley, CA 94720.), AW(California Institute of Technology, MC 405-47, 1200 East California Boulevard, Pasadena, CA 91125.), AX(Department of Physics and Astronomy, Johns Hopkins University, Homewood Campus, Baltimore, MD 21218.), AY(Space Sciences Laboratory, University of California at Berkeley, 601 Campbell Hall, Berkeley, CA 94720.), AZ(California Institute of Technology, MC 405-47, 1200 East California Boulevard, Pasadena, CA 91125.)
Publication:
The Astrophysical Journal, Volume 619, Issue 1, pp. L39-L42. (ApJL Homepage)
Publication Date:
01/2005
Origin:
UCP
ApJ Keywords:
Galaxies: Evolution, Galaxies: Fundamental Parameters, Galaxies: Starburst, Ultraviolet: Galaxies
DOI:
10.1086/424800
Bibliographic Code:
2005ApJ...619L..39S

Abstract

We derive a variety of physical parameters including star formation rates (SFRs), dust attenuation, and burst mass fractions for 6472 galaxies observed by the Galaxy Evolution Explorer (GALEX) and present in the Sloan Digital Sky Survey Data Release 1 (SDSS DR1) main spectroscopic sample. Parameters are estimated in a statistical way by comparing each observed broadband spectral energy distribution (SED) (two GALEX and five SDSS bands) with an extensive library of model galaxy SEDs, which cover a wide range of star formation histories and include stochastic starbursts. We compare the constraints derived using SDSS bands only with those derived using the combination of SDSS and GALEX photometry. We find that the addition of the GALEX bands leads to significant improvement in the estimation of both the dust optical depth and the star formation rate over timescales of 100 Myr to 1 Gyr in a galaxy. We attain sensitivity to SFRs as low as 10-3 Msolar yr-1, and we find that low levels of star formation (SF) are mostly associated with early-type, red galaxies. The least massive galaxies have ratios of current to past-averaged SF rates (b-parameter) consistent with constant SF over a Hubble time. For late-type galaxies, this ratio on average decreases with mass. We find that b correlates tightly with NUV-r color, implying that the SF history of a galaxy can be constrained on the basis of the NUV-r color alone. The fraction of galaxies that have undergone a significant starburst episode within the last 1 Gyr steeply declines with mass, from ~20% for galaxies with ~108 Msolar to ~5% for ~1011 Msolar galaxies.
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