The H-alpha and Infrared Star Formation Rates for the Nearby Field Galaxy Survey

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dc.creatorKewley, L. J.
dc.creatorGeller, M. J.
dc.creatorJansen, R. A.
dc.creatorDopita, M. A.
dc.date2002-08-28
dc.date2002-09-14
dc.date.accessioned2026-07-07T10:31:22Z
dc.date.available2026-07-07T10:31:22Z
dc.descriptionWe 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. 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 (within ~10%) between the two SFR indicators. 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 of these objects results from a young stellar population.
dc.description23 pages, 5 figures, 1 table. Accepted for publication in the Astronomical Journal. V2: Important changes: IRAS fluxes updated. Only moderate and good quality IRAS FIR fluxes are now used, resulting in slight changes to the equations and figures. The IR and H-alpha SFRs now agree to within ~10%, rather than ~30% as quoted previously
dc.identifierhttps://arxiv.org/abs/astro-ph/0208508
dc.identifierhttp://arxiv.org/abs/astro-ph/0208508
dc.identifierAstron.J.124:3135,2002
dc.identifierdoi:10.1086/344487
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/178389
dc.subjectAstrophysics
dc.titleThe H-alpha and Infrared Star Formation Rates for the Nearby Field Galaxy Survey
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