Fundamental Relationships in Galactic Disks

Stuart D. Ryder
1997 Publications Astronomical Society of Australia  
Although a number of correlations have been demonstrated between observable parameters in galaxies, such as surface brightness, luminosity, metallicity, etc., debate continues as to which of these parameters are truly fundamental. Following a major surface photometry program and Hii region abundance analysis, we have been able to show that the surface density of recent massive star formation, the surface density of stars already formed, and the mean oxygen abundance at a given galactic radius
more » ... e all fundamentally related within and between the disks of spiral galaxies. Such relationships can serve as powerful constraints on models of galactic evolution, requiring, for instance, a star formation law dependent not only on gas surface density, but also on the total mass surface density.
doi:10.1071/as97133 fatcat:wozhugyshba4dnkfvfpsuloy2q