Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...291....8m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 291, April 1, 1985, p. 8-31.
Astronomy and Astrophysics
Astrophysics
105
Astronomical Photometry, Elliptical Galaxies, Galactic Clusters, Luminosity, Radial Velocity, Brightness Distribution, Charge Coupled Devices, Galactic Evolution, Galactic Structure, Mass To Light Ratios
Scientific paper
The velocity dispersions for 46 galaxies and CCD surface photometry for 27 galaxies presented furnish a greatly improved data set for investigation of the brightest galaxies in galaxy clusters. The brightest cluster members (BCMs) are noted to be substantially brighter than predicted by such considerations as their velocity dispersions. Attention is given to the possibility that this may be a selection effect due to the spread of M at a given velocity dispersion; it is nevertheless shown that the observed distribution of luminosity excess does not correspond to a simple model for selection, unless the elliptical galaxy sample suffers a Malmquist bias of 0.4 mag. The BCMs with largest excess luminosity have the largest effective radii and the lowest surface brightness, as predicted by homologous merger models.
Kirshner Robert P.
Malumuth Eliot M.
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