Type Ia supernovae and the Hubble constant

Research done in the 1990s on Type Ia supernova (SNe Ia) shows that they are well suited for measuring the Hubble constant (H0). The minority of observed events that are intrinsically subluminous or significantly obscured by dust can be eliminated through use of a straightforward maximum-light color criterion. There is then a majority subsample with observational absolute-magnitude dispersions less than sigma obs (MsubB) about equal to sigma obs(M subV) about equal to 0.3 mag. Absolute magnitudes can be standardized to a greater extent through use of correlations between absolute magnitude and a minimum of one distance-independent SN Ia or parent-galaxy observables.