The nearby Abell clusters. II - Luminosity and spatial distribution of galaxies in A2175, A2256, and A2384

Details The nearby Abell clusters. II - Luminosity and spatial distribution of galaxies in A2175, A2256, and A2384 The nearby Abell clusters. II - Luminosity and spatial distribution of galaxies in A2175, A2256, and A2384

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93..519o&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 93, March 1987, p. 519-528. Research supported by the Research Corp.

Astronomy and Astrophysics

Astronomy

22

Galactic Clusters, Luminosity, Spatial Distribution, Astronomical Photography

Scientific paper

A study of the luminosity functions and spatial distributions of galaxies in the clusters A2175, A2256, and A2384 has been carried out, based on data obtained at the Palomar 1.2 m Schmidt and 1.5 m telescopes. The authors have also investigated in detail the accuracy of an automated star/galaxy classifier, by comparing the results obtained from the Schmidt plates of A2175 and A2384 with higher-spatial-resolution results from the 1.5 m telescope. Fits of Schechter functions to the luminosity functions of A2384 and A2256 yield values of Mr* ≡ -22, which is in good agreement with the "universal" value of Mr*. However, for these two clusters, slopes of the faint ends of the luminosity functions are distinctly flatter than the canonical value of α = -1.25. The best fit to the luminosity function of A2175 indicates a fairly steep faint end (α = -1.60). The spatial distributions of galaxies in these three clusters are well described by power laws, with no evidence for constant-density cores. These results, taken together with those reported by Beers and Tonry (1986), indicate a strong correlation between the density distribution of galaxies and the presence of a dominant D or cD galaxy in the cluster.

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