A Definitive Distance to the Coma Core Ellipticals

Details A Definitive Distance to the Coma Core Ellipticals A Definitive Distance to the Coma Core Ellipticals

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11711b&link_type=abstract

HST Proposal ID #11711. Cycle 17

Computer Science

Scientific paper

As the richest galaxy cluster in the local universe {cz < 10,000 km/s}, the Coma cluster continues to serve as the standard of comparison for numerous studies of galaxy properties and scaling relations in clusters. The central importance of Coma has been recognized with two recent HST large programs: a Treasury survey to study the dwarf galaxy population by imaging 82 different ACS/WFC pointings, and a program to measure Cepheid distances to two spiral galaxies projected within the Coma core region. An accurate distance to the Coma core is essential for comparing the galaxy luminosities and sizes to nearby galaxies in Virgo and Fornax, while an accurate peculiar velocity is needed for correctly tying to more distant clusters. However, experience dictates that Cepheid distances to clusters must be carefully verified against accurate measurements to the dominant early-type population, especially for such an unprecedented effort as the Coma Cepheid search {the completion of which remains uncertain}. We propose to measure highly accurate {3-4% internal error per galaxy} SBF distances to the two giant Coma core ellipticals. The reliability of the SBF method with the ACS/WFC has been repeatedly demonstrated, and it is so efficient that it requires only 3% of the number of orbits dedicated to the two current large Coma programs. The precise ACS SBF Coma core distance will also provide a good constraint on the Coma peculiar velocity, thus improving the accuracy of comparisons to distant clusters. Finally, our program will answer some longstanding puzzles surrounding the rich globular cluster population in the core of this archetypal galaxy cluster.;

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