First-ranked cluster galaxies - A two-population model

Details First-ranked cluster galaxies - A two-population model First-ranked cluster galaxies - A two-population model

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...338..718b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 338, March 15, 1989, p. 718-722.

Statistics

Computation

23

Astronomical Photometry, Computational Astrophysics, Galactic Clusters, Astronomical Models, Brightness Distribution, Electrophotometers

Scientific paper

The small dispersion in the absolute magnitudes (about 0.35 mag) of first-ranked galaxies in rich clusters has been the cause for much debate between the special and statistical hypotheses for these galaxies. Here, statistical evidence is presented that it is not the one or the other, but a combination. The distribution in magnitudes of the brightest galaxies is best explained if they consist of two distinct populations of objects: (1) a population of special galaxies having a Gaussian distribution of magnitudes with a small dispersion (0.21 mag), and (2) a population of extremes of a statistical luminosity function. The best-fit model requires that 63 percent of the clusters have a special galaxy that is, on average, 0.48 mag brighter than the brightest normal galaxy.

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