作者: Michael J. Pierce
DOI: 10.1007/978-94-009-4702-3_17
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摘要: The great success of the Hubble-Sandage system galaxy classification indicates that galaxies as a whole are remarkably similar. As result, global properties have proven to be extremely useful diagnostic tools for examining their stellar and gaseous content. This fortunate occurrence has allowed formulation Tully-Fisher (T-F) relationships estimating distances (Tully Fisher 1977; Aaronson et al. 1979). difference in slopes blue infrared relations implies correlations must exist between color 21-cm line width well absolute magnitude 1982).