Other
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6439z&link_type=abstract
HST Proposal ID #6439
Other
Hst Proposal Id #6439 Cosmology
Scientific paper
We propose to use the HST and WFPC2 to obtain periods and luminosities for Cepheids in a spiral galaxy in the Centaurus cluster in order to determine its distance. A Cepheid distance to Centaurus is possible with HST and will be a major step in the comparison of observed peculiar velocities with the predictions based on reconstructions of the density field from the spatial distribution of galaxies. The Centaurus region is critical for such tests. Secondary distance indicators {SBFs, Tully-Fisher, and D_n - Sigma} place this galaxy and others in the ``Cen30'' cluster at a distance of only about 2,300 - 2,700 kms, whereas the cluster has a redshift of 3,300 kms in the CMB frame. Such a high peculiar velocity is not predicted for this cluster by reconstructions of the density field based on IRAS or optical galaxy distributions. This cluster is the nearest and one of the clearest cases of disagreement between the peculiar motions inferred from secondary distance indicators and those predicted by the density fields. A great deal of theoretical and observational effort has gone into programs to determine Omega in this way. The major obstacle to progress has been discrepancies like those for the Centaurus cluster. To resolve this discrepancy, there is no substitute for directly obtaining Cepheid distances.
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