Computer Science
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8199d&link_type=abstract
HST Proposal ID #8199
Computer Science
Hst Proposal Id #8199 Clusters Of Galaxies And Lensing
Scientific paper
It is a curious fact that very little data are available to constrain the velocity field of galaxies in the local neighborhood {<= 500 km/sec}. Although tremendous progress has been made in recent years in mapping the large- scale gravitational field {out to scales of cz 10, 000 km/sec}, the major impediment to constraining the local flow is the lack of a consistent set of distances to nearby galaxies. Locally the deviations from a pure Hubble flow have been predicted to be large and measurable, as much as 1 magnitude in distance modulus. Such an effect should be easily detectable or refutable. This proposal aims to provide distances to a sample of nearby galaxies selected to lie at to the maximum in the predicted infall model. We propose to measure the distances to a sample of 13 galaxies with cz < 550 km/sec, specifically chosen to search for a strong anisotropy in the local flow field. Although previously, no fast, accurate method w as available to measure distances to nearby galaxies, this situation has recently changed. Distances will be measured using the discontinuity in the luminosity function at the tip of the red giant branch {TRGB}, a method with a solid empirical calibration having a precision comparable to Cepheid variables, but which is much more efficient in terms of observing time.
Davis Martin
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