Determination of the Extragalactic Distance Scale. Cycle 4 High

Details Determination of the Extragalactic Distance Scale. Cycle 4 High Determination of the Extragalactic Distance Scale. Cycle 4 High

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5397m&link_type=abstract

HST Proposal ID #5397

Astronomy and Astrophysics

Astrophysics

Hst Proposal Id #5397 Galaxies &Amp, Clusters Distance Scale

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 will provide the opportunity to break this impasse. We propose a program which in combination with other GTO and GO work should lead to a measurement of H_0 to 10 % accuracy. Our main goal is the observation of Cepheids in 21 fields in 19 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 will also be attempted. 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. Highlights of the proposal include a review of recent progress towards H_0 (2.2) and a critique and reaffirmation of the distance ladder approach (2.3). A project overview (2.4) and error budget are given (2.7). The details follow in subsequent sections. Now is the time to carry out this fundamental Hubble Space Telescope program.

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