Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5972m&link_type=abstract
HST Proposal ID #5972
Astronomy and Astrophysics
Astrophysics
Hst Proposal Id #5972 Galaxies &Amp, Clusters
Scientific paper
Many fundamental problems in cosmology and astrophysics remain unsettled because the value of the expansion rate is uncertain to a factor of two. The refurbished HST is providing the opportunity to break this impasse. We propose to continue a program, which. in combination with other GTO and GO work should lead to a measurement of H_0 to 10 Our main goal is the observation of Cepheids in 20 fields in 18 nearby galaxies, for the purpose of calibrating the best secondary distance indicators, including the infrared Tully-Fisher relation, the Planetary Nebula Luminosity Function, the Surface Brightness Fluctuation method, the type Ia supernovae standard candle and the type II supernova Expanding Photosphere Method. Measurement of Cepheids in the Virgo and Fornax clusters is also being carried out. A necessary associated goal of our proposal is strengthening the calibration of the Cepheid PL relation itself, largely via resolved study of star clusters in the LMC and M33. Unique features of this proposal include an end-to-end approach to the extragalactic distance scale, our discovery of Cepheids in Virgo, and a careful error budget for the Key Project.
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