Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.278..417a&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. Vol. 278, No. 2, p. 417 - 436
Astronomy and Astrophysics
Astronomy
30
Galaxies: Evolution -- Galaxies: Photometry -- Galaxies: Stellar Content -- Infrared: Galaxies, Starburst Galaxies: Spectra, Starburst Galaxies: Infrared Photometry, Starburst Galaxies: Star Formation
Scientific paper
The authors present a detailed analysis of the star formation history in a small sample of star forming galaxies selected from the UCM (Universidad Complutense de Madrid) survey. The most direct way of doing that is by using an Hα-selected sample of galaxies, since the Hα luminosity is directly related to the present rate of star formation. Optical photometry and spectroscopy provide the necessary information to study their short-term star formation. To characterize the long-term star formation history, near-infrared photometry is essential since near-infrared light is dominated by stars with long-lived progenitors for early stages of the star formation episode. After approximately 107yr, the appearance of high-mass supergiants might dominate the infrared colours for a few million years, depending on the mass involved in the burst of star formation. Optical r and near-infrared JHK imaging, together with optical spectroscopy, has been obtained for seven galaxies of the UCM sample. These data, interpreted using Bruzual and Charlot's (1993) evolutionary synthesis models combined with the authors' own nebular emission models, allow them to determine the star formation properties of the galaxies. The equivalent widths of Balmer lines, especially Hα, provide very good quantitative diagnostics for the star formation. An expression for the "effective" present-day star formation rate (SFR) in terms of the Hα luminosity is derived for the galaxies in the sample.
Alonso-Herrero Almudena
Aragon-Salamanca Alfonso
Rego M.
Zamorano Jaime
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