Determination of the Extragalactic Distance Scale: I. M81

Details Determination of the Extragalactic Distance Scale: I. M81 Determination of the Extragalactic Distance Scale: I. M81

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.2227m&link_type=abstract

HST Proposal ID #2227

Astronomy and Astrophysics

Astrophysics

Hst Proposal Id #2227

Scientific paper

Many fundamental problems in cosmology and astrophysics remain undetermined because the value of the expansion rate is uncertain to a factor of two. 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 Ho to 10 % accuracy. Our main goal is the observation of Cepheids in two dozen fields in nearby galaxies, for the primary purpose of calibrating the infrared Tully-Fisher relation. The accumulated data will also allow investigation of other secondary distance indicators, including the brightest resolved stars, supernovae, and calibration of the Faber Jackson relation. 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, M31, and M33.

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