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For refcode 1997ApJ...483L..37T:
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1997ApJ...483L..37T The Distance to the Coma Cluster from Surface Brightness Fluctuations BJARNE THOMSEN Institute of Physics and Astronomy, University of Aarhus, Ny Munkegade, DK-8000 Aarhus C, Denmark; bt@obs.aau.dk WILLIAM A. BAUM AND MARK HAMMERGREN Astronomy Department, University of Washington, Box 351580, Seattle, WA 98195; baum@astro.washington.edu, hammer@astro.washington.edu AND GUY WORTHEY Astronomy Department, University of Michigan, Ann Arbor, MI 48109-1090; worthey@astro.lsa.umich.edu Received 1996 November 6; accepted 1997 April 10 ABSTRACT We report on the first determination of the distance to the Coma Cluster from surface brightness fluctuation (SBF) measurements obtained from Hubble Space Telescope WFPC2 observations of the bright E0 galaxy NGC 4881 in the Coma Cluster and ground-based observations of the "standard" E1 galaxy NGC 3379 in the Leo-I group. Relative distances based on the I-band fluctuation magnitude, m^bar^_I_, are strongly dependent on the metallicity and age of the stellar population. However, the radial changes in the stellar populations of the two giant ellipticals NGC 3379 and NGC 4881 are well described by published Mg_2_ gradients, and the ground-based measurements of m^bar^_I_ at several radial points in NGC 3379 are used to calibrate m^bar^_I_ in terms of the Mg_2_ index. The distance to NGC 3379, assumed to be identical to the average SBF distance of the Leo-I group, is combined with the new SBF measurements of NGC 4881 to obtain a Coma Cluster distance of 102 +/- 14 Mpc. Combining this distance with the cosmic recession velocity of the Coma Cluster (7186 +/- 428 km s^-1^), we find the Hubble constant to be H_0_ = 71 +/- 11 km s^-1^ Mpc^-1^. Subject headings: distance scale-galaxies: distances and redshifts - galaxies: individual (NGC 4881, NGC 3379)
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