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Luminosity Segregation in Distant Galaxy Clusters

Published online by Cambridge University Press:  19 July 2016

Guy Mathez ,
Olivier Le fèvre ,
Yannick Mellier ,
Genevieve Soucail  and
Alain Mazure
Guy Mathez
Affiliation:
: Observatoire 14, Av. E. Belin F31400 Toulouse France
Olivier Le fèvre
Affiliation:
: CFHT Corp. P.O. Box 1597 Kamuela Hawaii 96743, USA
Yannick Mellier
Affiliation:
: Observatoire 14, Av. E. Belin F31400 Toulouse France
Genevieve Soucail
Affiliation:
: Observatoire 14, Av. E. Belin F31400 Toulouse France
Alain Mazure
Affiliation:
: Observatoire Place J. Janssen 92195 Meudon Cedex France

Abstract

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Angular separation-magnitude plots drawn from deep photometry of galaxies in distant clusters show evidence for luminosity segregation which cannot be accounted for by field contamination. This segregation, interpreted in terms of dynamical friction, allows one to determine (M/L)g, the mass-to-light ratio of galaxies from their velocity dispersion. In A370 (z=0.37) more than 30 velocities have been measured by multi-aperture spectroscopy, leading to (M/L)g ∼70. Values greater than 100 are found in 5 other distant clusters by deriving the velocity dispersion from the richness. The luminosity segregation, observed even inside each of the clumps of 3C299, could result either from dynamical friction inside the clumps or from some early environmental influence.

Type
Chapter VIII: Galaxies and Clusters
Information
Symposium - International Astronomical Union , Volume 124: Observational Cosmology , 1987 , pp. 519 - 521
Copyright
Copyright © Reidel 1987 

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