AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 39. Results from the HST Key Project on the Extragalactic Distance Scale
Topical, Oral, Tuesday, June 1, 1999, 8:30-10:00am, 10:45am-12:30pm, 2:30-4:00pm, International Ballroom South

[Previous] | [Session 39] | [Next]

[39.03] The Calibration of the Tully--Fisher Relations and the Value of H0

S. Sakai (KPNO), J. Mould (MSSSO), J. Huchra (CfA), R. Kennicutt (Steward), L. Macri (CfA), S. Hughes (Cambridge), HST H$_0$ Key Project Team

We report the Tully--Fisher (TF) calibration effort of the Hubble Space Telescope Key Project on the Extragalactic Distance Scale. The BVRIH-0.5 TF relations are based on Cepheid distances to 19 galaxies and 30 clusters within 15,000 km s-1. These relations were then applied to distant cluster data in order to derive a value for the Hubble constant, H0. We have also investigated how various systematic uncertainties affect the value of H0 such as the internal extinction correction method used, Tully--Fisher slopes and shapes, a possible metallicity dependence of the Cepheid variable period--luminosity relation and cluster population incompleteness bias.

If the author provided an email address or URL for general inquiries, it is a s follows:

[Previous] | [Session 39] | [Next]