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Title:
Studies of the Virgo cluster. VI - Morphological and kinematical structure of the Virgo cluster
Authors:
Binggeli, Bruno; Tammann, G. A.; Sandage, Allan
Affiliation:
AA(Basel, Universitaet, Binningen, Switzerland), AB(Basel, Universitaet, Binningen, Switzerland), AC(Johns Hopkins University; Space Telescope Science Institute, Baltimore, MD)
Publication:
Astronomical Journal (ISSN 0004-6256), vol. 94, Aug. 1987, p. 251-277. SNSF-supported research. (AJ Homepage)
Publication Date:
08/1987
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ASTRONOMICAL MODELS, GALACTIC EVOLUTION, GALACTIC STRUCTURE, KINEMATICS, VIRGO GALACTIC CLUSTER, DENSITY DISTRIBUTION, LUMINOSITY, RADIAL VELOCITY, SPATIAL DISTRIBUTION, VELOCITY DISTRIBUTION
DOI:
10.1086/114467
Bibliographic Code:
1987AJ.....94..251B

Abstract

The structure of the Virgo cluster is analyzed on the basis of the positions, Hubble types, and radial velocities of 1277 Virgo cluster galaxies. The surface distribution of galaxies is considered according to type, and is discussed using maps, isopleths, strip counts, and radial-density distributions. It is found that the Virgo cluster shows pronounced double structure. The main concentration has a large velocity dispersion and is made up predominantly of early-type galaxies, while the secondary concentration has a much smaller velocity dispersion and contains late types. There is a strong spatial segregation of the Hubble types, the early-type galaxies being more concentrated toward the cluster center. There is significant substructure in the cluster core. The irregularity of the Virgo cluster in both configuration and velocity space shows that the core and the envelope are still forming, and hence that the cluster is young.

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