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Evolution of the star formation efficiency in galaxies

Published online by Cambridge University Press:  05 March 2015

Jonathan Braine
Jonathan Braine*
Affiliation:
Laboratoire d'Astrophysique de BordeauxFrance, email: [email protected]
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Abstract

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The physical and chemical evolution of galaxies is intimately linked to star formation, We present evidence that molecular gas (H2) is transformed into stars more quickly in smaller and/or subsolar metallicity galaxies than in large spirals – which we consider to be equivalent to a star formation efficiency (SFE). In particular, we show that this is not due to uncertainties in the N(H2)/Ico conversion factor. Several possible reasons for the high SFE in galaxies like the nearby M33 or NGC 6822 are proposed which, separately or together, are the likely cause of the high SFE in this environment. We then try to estimate how much this could contribute to the increase in cosmic star formation rate density from z = 0 to z = 1.

Keywords

Stars: FormationInterstellar MediumGalaxies: M33Galaxies: Local Group
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Highlights H16: Highlights of Astronomy , August 2012 , pp. 341
Copyright
Copyright © International Astronomical Union 2015 

References

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