Physics
Scientific paper
Apr 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..761...59k&link_type=abstract
THE SPECTRAL ENERGY DISTRIBUTIONS OF GAS-RICH GALAXIES: Confronting Models with Data; International Workshop. AIP Conference Pr
Physics
3
Origin, Formation, Evolution, Age, And Star Formation, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies, Intergalactic Matter, Quasar Absorption And Emission-Line Systems, Lyman Forest
Scientific paper
Emission line diagnostics provide a powerful tool for extracting fundamental global properties of galaxies. In this paper, we review the common optical emission-line diagnostics for star-formation and discuss our recent progress in this area. We focus on our recent results using H-alpha and [OII] as star formation rate (SFR) indicators for local and high-z samples. In local samples, correction of the SFR(H-alpha) for extinction using the Balmer decrement and a classical reddening curve reduces the scatter and discrepancy between SFR(H-alpha) and reddening-insensitive SFR estimates. Using a combination of stellar population synthesis and photoionization models, we investigate the cause of the systematic discrepancy between SFRs derived from [OII] and those derived from H-alpha. There are two significant effects which produce strong disagreement between SFR([OII]) and SFR(H-alpha): reddening and metallicity. Such a disagreement can appear as a function of redshift, contaminating cosmic star formation history studies. We discuss our new theoretical SFR([OII]) calibration which does not contain a reddening assumption, and includes an optional correction for metallicity. This new SFR([OII]) calibration removes the previously observed discrepancy between the SFR([OII]) and SFR(Hα) for both nearby and high redshift samples.
Geller Margaret J.
Jansen Rolf A.
Kewley Lisa J.
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