Reconciling the SBF and SNIa Distance Scales

Details Reconciling the SBF and SNIa Distance Scales Reconciling the SBF and SNIa Distance Scales

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8212a&link_type=abstract

HST Proposal ID #8212

Physics

Hst Proposal Id #8212 Clusters Of Galaxies And Lensing

Scientific paper

We propose to use WFPC2 to measure surface brightness fluctuation {SBF} distances to host galaxies of well-measured type Ia supernovae {SNIa} in order to resolve the discrepancy between H_0 values determined from SBF distances and from SNIa distances. Currently, SBF distances yield H_0 80 km/s/Mpc, and SNIa distances yield H_0 60. While both of these distance estimators provide excellent internal error consistency {near 5 percent}, some still unknown systematic errors are preventing these methods from providing consistent values for the Hubble parameter. Given that there are so few reliable methods for determining distances over large ranges, it is imperative that we understand the discrepancy between the SBF and SNIa methods. Only then can these methods converge on the true value of H_0.

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