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Date and Time of the Query: 2019-05-19 T07:01:32 PDT
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For refcode 2002AJ....124.3135K:
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2002AJ....124.3135K THE H{alpha} AND INFRARED STAR FORMATION RATES FOR THE NEARBY FIELD GALAXY SURVEY LISA J. KEWLEY Harvard-Smithsonian Center for Astrophysics, MS-20, 60 Garden Street, Cambridge, MA 02138; lkewley@cfa.harvard.edu MARGARET J. GELLER Smithsonian Astrophysical Observatory, MS-20, 60 Garden Street, Cambridge, MA 02138 ROLF A. JANSEN Department of Physics and Astronomy, Arizona State University. P.O. Box 871504, Tempe, AZ 85287-1504 AND MICHAEL A. DOPITA Research School of Astronomy and Astrophysics, Australian National University, Cotter Road, Weston Creek, Canberra, ACT 2611, Australia Received 2002 August 15; accepted 2002 August 28 ABSTRACT We investigate the H{alpha} and infrared star formation rate (SFR) diagnostics for galaxies in the Nearby Field Galaxy Survey (NFGS). For the 81 galaxies in our sample, we derive H{alpha} fluxes (included here) from integrated spectra. There is a strong correlation between the ratio of far-infrared to optical luminosities L(FIR)/L(H{alpha}) and the extinction E(B-V) measured with the Balmer decrement. Before reddening correction, the SFR(IR) and SFR(H{alpha}) are related to each other by a power law: SFR(IR) = (2.7 +/- 0.3)SFR(H{alpha})^1.30+/-0.06^. Correction of the SFR(H{alpha}) for extinction using the Balmer decrement and a classical reddening curve both reduces the scatter in the SFR(IR)-SFR(H{alpha}) correlation and results in a much closer agreement between the two SFR indicators; SFR(IR) = (0.91 +/- 0.04)SFR(H{alpha}corr)^1.07+/-0.03^. SFR(IR) and SFR(H{alpha}) agree to ~10%. This SFR relationship spans 4 orders of magnitude and holds for all Hubble types with IRAS detections in the NFGS. A constant ratio between the SFR(IR) and SFR(H{alpha}) for all Hubble types, including early types (S0-Sab), suggests that the IR emission in all these objects results from a young stellar population. Key words: dust, extinction - galaxies: spiral - galaxies: starburst
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