Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6579t&link_type=abstract
HST Proposal ID #6579
Physics
Hst Proposal Id #6579 Cosmology
Scientific paper
We request deep WFPC2 images of five galaxies in clusters near the Centaurus Cluster to determine their distances and peculiar velocities using the Surface Brightness Fluctuation {SBF} method. We expect to determine whether the Centaurus galaxies are falling into the "Great Attractor", and distinguish between the claims that there is convergence of the flow beyond Centaurus {return to CMB rest frame} instead of continued 600 km/s bulk flow. Confirmation of the latter would indicate that coherent peculiar velocities are generated over an enormous scale. HST is required as the ground-based SBF method becomes impossible beyond 3, 000 km/s. The high spatial resolution of HST permits precise measurement of the SBF signal at very large distances, and allows easy recognition of globular clusters and background galaxies in the galaxy images that must be removed prior to SBF detection. The proposing team developed the SBF method, has worked extensively in the field of large scal e flows, played major roles in the calibration of WFPC and WFPC2, and are conducting GTO observations which will help validate the zeropoint and application of the SBF method for local galaxies.
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