Reducing Systematic Errors on the Hubble Constant: Metallicity Calibration of the Cepheid PL Relation

Details Reducing Systematic Errors on the Hubble Constant: Metallicity Calibration of the Cepheid PL Relation Reducing Systematic Errors on the Hubble Constant: Metallicity Calibration of the Cepheid PL Relation

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hst..prop10918f&link_type=abstract

HST Proposal ID #10918. Cycle 15

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Reducing the systematic errors on the Hubble constant is still of significance and of immediate importance to modern cosmology. One of the largest remaining uncertainties in the Cepheid-based distance scale which itself is at the foundation of the HST Key Project determination of H_o which can now be addressed directly by HST, is the effect of metallicity on the Cepheid Period-Luminosity relation. Three chemically distinct regions in M101 will be used to directly measure and thereby calibrate the change in zero point of the Cepheid PL relation over a range of metallicities that run from SMC-like, through Solar, to metallicities as high as the most metal-enriched galaxies in the pure Hubble flow. ACS for the first time offers the opportunity to make a precise calibration of this effect which currently accounts for at least a third of the total systematic uncertainty on Ho. The calibration will be made in the V and I bandpasses so as to be immediately and directly applicable to the entire HST Cepheid-based distance scale sample, and most especially to the highest-metallicity galaxies that were hosts to the Type Ia supernovae, which were then used to extend the the distance scale calibration out to cosmologically significant distances.

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