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Downsizing in HII galaxies

Published online by Cambridge University Press:  01 August 2006

R. Terlevich ,
J. López  and
E. Terlevich
R. Terlevich
Affiliation:
Department of Astrophysics, INAOE, México. email: rjt@inaoep.mx, jlopez@inaoep.mx, eterlevi@inaoep.mx
J. López
Affiliation:
Department of Astrophysics, INAOE, México. email: rjt@inaoep.mx, jlopez@inaoep.mx, eterlevi@inaoep.mx
E. Terlevich
Affiliation:
Department of Astrophysics, INAOE, México. email: rjt@inaoep.mx, jlopez@inaoep.mx, eterlevi@inaoep.mx
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Abstract

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In this work we estimated the statistical age of a set of HII galaxies obtained from the Sloan Digital Sky Survey Data Release Three (SDSS DR3). Applying an inversion method to the observed distribution of an age sensitive parameter such as the equivalent width of (Hα), we estimate the age of the galaxies. We find strong dependence of the age with stellar luminosity, mass and metallicity with the youngest HII galaxies being those with the lowest mass and metallicity. These dependences found among HII galaxies indicate that “downsizing” extends to the low end of the mass distribution of galaxies.

Keywords

galaxies: evolutionformationISM: HII regions
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S235: Galaxy Evolution Across the Hubble Time , August 2006 , pp. 284 - 287
Copyright
Copyright © International Astronomical Union 2007

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