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For refcode 1994MNRAS.267..431M:
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Copyright by Royal Astronomical Society. 1994MNRAS.267..431M Multicolour photometry of the Shapley 8 cluster of galaxies N. Metcalfe, J. G. Godwin and J. V. Peach Physics Department, University of Durham, South Road, Durham DH1 3LE Department of Physics, Nuclear and Astrophysics Laboratory, Keble Road Oxford 0X1 3RH Accepted 1993 November 8. Received 1993 November 8; in original form 1993 June 9 ABSTRACT In a previous paper, we measured 40 redshifts in the core of the rich southern cluster Shapley 8. We now present photographic b_26.75_ magnitudes, radii, and ellipticities, together with (u - b) and (b -r) colours for 4903 galaxies within a 4.69 square degree field around this cluster. We have also measured (r - i) colours for a subset of these galaxies around the cluster core. Our sample is essentially complete to b_26.75_ = 20.85. We discuss the colour-related properties of the cluster, together with its luminosity function and spatial distribution. We find a deficit of blue galaxies in the cluster core, implying morphological segregation, and also evidence that the brightest galaxies are less tightly clustered than the rest. There is a clear change of slope at M_b_ ~ -20.4 in the ultraviolet colour-magnitude relations for the E/S0 galaxies. We also show how the colour data can be used to isolate high-redshift background galaxies. The mass enclosed within the area we have studied is 4.5 X 10^15^ M_sun_, which appears to be too low for the Shapley Supercluster to be the explanation of the `Great Attractor'. Key words: galaxies: clusters: individual: Shapley 8 - galaxies: luminosity function, mass function - galaxies: photometry.
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