NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-17 T22:32:10 PDT
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For refcode 1997A&A...325..961K:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1997A&A...325..961K The star formation law in disk galaxies: a Bayesian view. Koeppen J., Froehlich H.-E. Received 30 October 1996/Accepted 8 April 1997 Abstract. The dependence of the star formation rate {PSI} is proportional to g^x^/r^y^ on gas surface density g and galactocentric radius r are studied in disk galaxies. The sample includes the Milky Way galaxy and 11 nearby Sb and Sc galaxies with known radial gas surface densities and H{alpha} surface brightnesses, used as a measure of the SFR. The Bayesian approach permits to compute genuine probabilities for the validity of several different functional forms. We do not find any significant explicit dependence of the SFR on radius. A linear dependence on gas density {PSI} is proportional to g is found to be an order of magnitude more probable than any universal non-linear law. If each galaxy has its own exponent x, the non-linear law {PSI} is proportional to g^x^ would also be highly probable. These findings are fairly independent of the CO- H_2_ conversion recipe used. Key words: methods: data analysis - methods: statistical - stars: formation - Galaxy: structure - galaxies: ISM - galaxies: spiral
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