The Centaurus cluster of galaxies. II - The bimodal velocity structure

Details The Centaurus cluster of galaxies. II - The bimodal velocity structure The Centaurus cluster of galaxies. II - The bimodal velocity structure

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.221..453l&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 221, July 15, 1986, p. 453-472. SERC-supported research

Astronomy and Astrophysics

Astronomy

90

Distribution Functions, Galactic Clusters, Velocity Distribution, Astronomical Catalogs, Color-Magnitude Diagram, Elliptical Galaxies, Maximum Likelihood Estimates, Red Shift, Spatial Distribution, Spiral Galaxies

Scientific paper

The bimodal velocity distribution of the galaxies in the Centaurus cluster (α = 12h47m, δ = -41°) is discussed. The mean heliocentric velocities and line-of-sight dispersions of the two main cluster components, within 3° of the cluster centre, are 3041, 586 km s-1 (denoted Cen 30) and 4570, 262 km s-1 (denoted Cen 45) respectively. Cen 30 is dominant, having about 2.5×the population of Cen 45. Each of the two major components has a large elliptical galaxy lying at its dynamical centre; NGC 4696 in Cen 30 and NGC 4709 in Cen 45. Direct comparisons of the U-V colour-magnitude relationship, the luminosity functions and the galaxian-radius distributions of the core samples of the two components allow their relative distance to be estimated. Provided environmental differences between the components are not important, these methods strongly favour the hypothesis that the two components lie within the same cluster.

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