A Cepheid Distance to the Coma Cluster

Details A Cepheid Distance to the Coma Cluster A Cepheid Distance to the Coma Cluster

Feb 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007noao.prop..536c&link_type=abstract

NOAO Proposal ID #2007A-0536

Physics

Scientific paper

We have been awarded 180 orbits of HST time to discover Cepheids in gla and glb, two spiral galaxies located in the Coma Cluster, with the goal of obtaining a direct measurement of the Hubble constant without relying on secondary distance indicators. We request two nights of Kitt Peak 4-m time and two nights of WIYN 3.5-m time to characterize certain systematic uncertainties of the HST measurements. We will use the Kitt Peak 4-m telescope to acquire medium- resolution spectroscopy of H II regions to characterize the abundance gradient in the target galaxies and estimate the metallicity of the Cepheids. We will use the WIYN 3.5-m telescope to calibrate the instantaneous zeropoint of our HST/ACS photometry to an accuracy of 1% in the V and I bands. These observations play a critical role in reducing our error budget and enabling the first-ever Cepheid-based measurement of H_0 in the Hubble flow.

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