Correlations among the properties of galaxies found in a blind HI survey, which also have SDSS optical data

摘要

We have used the Parkes Multibeam system and the Sloan Digital Sky Survey(SDSS) to assemble a sample of 195 galaxies selected originally from their HIsignature to avoid biases against unevolved or low surface brightness objects.For each source 9 intrinsic properties are measured homogeneously, as well asinclination and an optical spectrum. The sample, which should be almostentirely free of either misidentification or confusion, includes a widediversity of galaxies ranging from inchoate, low surface brightness dwarfs togiant spirals. Despite this diversity there are 5 clear correlations amongtheir properties. They include a common dynamical mass-to-light ratio withintheir optical radii, a correlation between surface-brightness and Luminosityand a common HI surface-density. Such correlation should provide strongconstrains on models of galaxy formation and evolution.