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Title:
The dynamics and structure of the cD galaxy in Abell 2029
Authors:
Dressler, A.
Affiliation:
AA(Hale Observatories, Pasadena, Calif.)
Publication:
Astrophysical Journal, Part 1, vol. 231, Aug. 1, 1979, p. 659-670. (ApJ Homepage)
Publication Date:
08/1979
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ASTRODYNAMICS, GALACTIC CLUSTERS, GALACTIC STRUCTURE, ASTRONOMICAL PHOTOGRAPHY, CROSS CORRELATION, DATA PROCESSING, DENSITY DISTRIBUTION, GRAPHS (CHARTS), STELLAR LUMINOSITY, STELLAR SPECTRA
Comment:
A&AA ID. AAA026.158.013
DOI:
10.1086/157229
Bibliographic Code:
1979ApJ...231..659D

Abstract

Spectra of the envelope of the cD galaxy in the rich cluster of galaxies Abell 2029 out to over 100 kpc are analyzed by using a Fourier cross-correlation technique. It is found that the measured velocity dispersion apparently increases with radius, implying that the M/L ratio of the envelope is increasing rapidly. All that is presently known about the cluster and the cD galaxy is accounted for by a three-component King (1966) model consisting of a 'normal elliptical' galaxy, a high-M/L cluster-filling and cluster-binding superstructure, and a component of intermediate M/L and velocity dispersion that supplies the light of the 'extended halo'. The high-M/L component is tentatively identified with stripped dark halos of cluster galaxies, and the intermediate-M/L material is attributed to the dynamical friction process that disrupts massive luminous galaxies as they encounter the cD envelope.

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