A Reevaluation Of The Cepheid Distance Scale From A Homogeneous Analysis Of 22 Galaxies Observed With WFPC2

Details A Reevaluation Of The Cepheid Distance Scale From A Homogeneous Analysis Of 22 Galaxies Observed With WFPC2 A Reevaluation Of The Cepheid Distance Scale From A Homogeneous Analysis Of 22 Galaxies Observed With WFPC2

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21012112d&link_type=abstract

American Astronomical Society Meeting 210, #121.12; Bulletin of the American Astronomical Society, Vol. 39, p.330

Biology

Quantitative Biology

Quantitative Methods

Scientific paper

One of the most valuable datasets in the HST archive is the collection of repeated images of nearby galaxies obtained in an effort to determine H_0 through the analysis of Cepheid variable stars. While several groups have contributed to this effort, there has never been a uniform study of the entire collection of galaxies in which all galaxies are subjected to identical procedures in each step of the analysis. As part of an HST Archival Legacy study, we are conducting a homogeneous analysis of all WFPC2 images obtained for Cepheid studies, with the aim of achieving a uniform recalibration of the Cepheid distance scale using rigorous, quantitative methods of analysis. As a by-product of this investigation, we will produce a catalog of two-color photometry of over two million objects that will be made available to the community. Here we present the first Cepheid distance results from these studies, with an emphasis on type Ia supernova host galaxies.
This work is partially supported by NASA through grant HST-AR-10673.

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