Emission-line galaxies from SDSS DR4: Statistical studies of the current star formation |
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Authors: | I Yu Izotova S L Parnovsky |
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Institution: | (1) Astronomical Observatory, Taras Shevchenko Kiev National University, ul. Observatornaya 3, Kiev, 04053, Ukraine |
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Abstract: | For a sample of 8156 emission-line galaxies from the Sloan Digital Sky Survey Data Release 4 (SDSS DR4), we have determined the current star formation rates (SFR) from three parameters: the Hα luminosity of H II regions corrected for the aperture and interstellar extinction (N = 7006 galaxies), the far-infrared luminosity (IRAS data, N = 350), and the monochromatic luminosity in the radio continuum at ν = 1.4 GHz (NVSS data, N = 475). A Salpeter initial mass function with the range of stellar masses 0.1–100 M ⊙ was assumed in the SFR FIR calculations. In calculating SFR1.4, we assumed that the fraction of the thermal emission in the total radio continuum emission of the galaxy at 1.4 GHz was 10%. An upper limit for the starburst age has been determined for galaxies with known abundances of heavy elements. We compare our results with those of similar studies for isolated and Markarian H II galaxies. |
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