Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.6807k&link_type=abstract
American Astronomical Society, 189th AAS Meeting, #68.07; Bulletin of the American Astronomical Society, Vol. 28, p.1360
Astronomy and Astrophysics
Astronomy
1
Scientific paper
A critical ingredient for modelling galaxy formation and evolution is the parametric relationship between the large-scale star formation rate (SFR) and the physical conditions in the interstellar medium. Most contemporary evolution models still use as their basic SFR `recipe' a simple Schmidt power-law relation between the SFR and gas density, with index n = 1 - 2. The Schmidt law provides an excellent parametrization of the SFR at the high gas densities that are characteristic of active star forming disks, but its empirical form and physical basis are not well understood. This paper presents preliminary results from a new study of the global star formation law in galactic disks, based on new CCD Hα observations of an HI/CO-selected sample of nearby galaxies, combined with published data from a variety of sources. The data have been used to investigate the empirical form of the star formation law over a wide range of physical conditions, to test the validity and limits of the Schmidt law approximation, and to investigate the underlying physical basis of the observed relation.
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