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Date and Time of the Query: 2019-04-22 T11:22:52 PDT
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For refcode 1988A&A...202...70A:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1988A&A...202...70A What is the mean redshift of the Virgo cluster? H. Arp Max-Planck-Institut fur Physik und Astrophysik, Institut fur Astrophysik, Karl-Schwarzschild-Strasse 1, D-8046 Garching, Federal Republic of Germany Received May 21, 1987; accepted March 4, 1988 Summary. The most certain members of the Virgo cluster have a luminosity weighted mean redshift of v^bar^^L^_0_ = 863 km s^-1^. This is significantly different from the values in common use of v^bar^ = 967 km s^-1^ (Tammann and Sandage) and <v_0_>=1165 km s^-1^ (de Vaucouleurs). It is necessary to adopt the mean redshift of the mass of the material which defines the cluster. Naturally this lowers any value of the Hubble constant based on the Virgo cluster. The discrepancy between the luminosity weighted mean and the number mean is due to the fact that the higher redshift members have fainter apparent magnitudes. It is shown that particularly the S0 and Sb galaxies in the Virgo Cluster have strong, continuous redshift-apparent magnitude relations. The effect is very large, spanning over 2000 km s^-1^ in redshift. It is noted that all major groups and clusters have redshift-galaxy type relations in which Sb galaxies possess the lowest redshifts and the Sc's have the highest. In the Virgo cluster the material present in Sb's and SBb's has a mean redshift of only v^bar^^L^_0_ = 97 km s^-1^. Key words: clusters of galaxies - distance - galaxies: redshifts
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