Mathematics – Logic
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.267..431m&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 267, no. 2, p. 431-446
Mathematics
Logic
39
Astronomical Catalogs, Astronomical Photography, Astronomical Photometry, Galactic Clusters, Color Photography, Luminosity, Red Shift, Strange Attractors
Scientific paper
In a previous paper, we measured 40 redshifts in the core of the rich southern cluster Shapley 8. We now present photographic b26.75 magnitudes, radii and ellipticities, together with (u-b) and (b-r) colors for 4903 galaxies within a 4.69 square degree field around this cluster. We have also measured (r-i) colors for a subset of these galaxies around the cluster core. Our sample is essentially complete to b26.75 = 20.85. We discuss the color-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 Mb approximately equal to -20.4 in the ultraviolet color-magnitude relations for the E/SO galaxies. We also show how the color data can be used to isolate high-redshift background galaxies. The mass enclosed within the area we have studied is 4.5 x 1015 Stellar Mass, which appears to be too low for the Shapley Supercluster to be the explanation of the 'Great Attractor'.
Godwin J. G.
Metcalfe Nigel
Peach John V.
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