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          Institute: MPI für Astrophysik     Collection: Cosmology     Display Documents

ID: 10974.0, MPI für Astrophysik / Cosmology
Star formation, metallicity and dust properties derived from the Stromlo-APM galaxy survey spectra
Authors:Charlot, S.; Kauffmann, G.; Longhetti, M.; Tresse, L.; White, S. D. M.; Maddox, S. J.; Fall, S. M.
Date of Publication (YYYY-MM-DD):2002
Title of Journal:Monthly Notices of the Royal Astronomical Society
Journal Abbrev.:Mon. Not. Roy. Astron. Soc.
Issue / Number:4
Start Page:876
End Page:888
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We have derived star formation rates (SFRs), gas-phase oxygen abundances and effective dust absorption optical depths for a sample of galaxies drawn from the Stromlo-APM redshift survey using the new model of Charlot & Longhetti (CLO1), which provides a physically consistent description of the effects of stars, gas and dust on the integrated spectra of galaxies. Our sample consists of 705 galaxies with measurements of the fluxes and equivalent widths of Halpha, [O II] and one or both of [N II] and [S II]. For a subset of the galaxies, 60- and 100-mum IRAS fluxes are available. We compare the star formation rates derived using the model with those derived using standard estimators based on the Halpha, the [O II] and the far-infrared luminosities of the galaxies. The CL01 SFR estimates agree well with those derived from the IRAS fluxes, but are typically a factor of similar to3 higher than those derived from the Halpha or the [O II] fluxes, even after the usual mean attenuation correction of A(Halpha) = 1 mag is applied to the data. We show that the reason for this discrepancy is that the standard Halpha estimator neglects the absorption of ionizing photons by dust in H II regions and the contamination of Halpha emission by stellar absorption. We also use our sample to study variations in star formation and metallicity as a function of galaxy absolute b(J) magnitude. For this sample, the star formation rate per unit b(J) luminosity is independent of magnitude. The gas-phase oxygen abundance does increase with b(J) luminosity, although the scatter in metallicity at fixed magnitude is large.
Free Keywords:galaxies : general; galaxies : ISM; galaxies : stellar content
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astrophysik
External Affiliations:Inst Astrophys, CNRS, 98 Bis Blvd Arago, F-75014 Paris, France; Inst Astrophys, CNRS, F-75014 Paris, France; Max Planck Inst Astrophys, D-85748 Garching, Germany; Osserv Astron Brera, I-23807 Merate, LC, Italy; Lab Astrophys Marseille, CNRS, F-13376 Marseille 12, France; Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England; Space Telescope Sci Inst, Baltimore, MD 21218 USA
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