The structure and dynamics of Abell 2670. I - M/L ratio and orbital anisotropy

Details The structure and dynamics of Abell 2670. I - M/L ratio and orbital anisotropy The structure and dynamics of Abell 2670. I - M/L ratio and orbital anisotropy

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.231..479s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 231, March 15, 1988, p. 479-508. SERC-supported researc

Astronomy and Astrophysics

Astronomy

92

Astrodynamics, Astronomical Spectroscopy, Galactic Clusters, Mass To Light Ratios, Astronomical Catalogs, Cosmic Plasma, Dark Matter, Data Sampling, Density (Mass/Volume), Red Shift, Velocity Distribution

Scientific paper

The authors present a faint photometric and spectroscopic study of 303 galaxies centred on the rich cD cluster Abell 2670 (z = 0.076). Redshifts have been obtained for complete galaxy samples extending up to 4.8 Mpc from the cluster centre and a velocity dispersion profile for the cluster members has been determined with good precision out to ≡3 Mpc. The authors discuss the possibility of sub-clustering in the galaxy distribution. For dynamical models with constant M/L ratio, substantial radial anisotropy is required in the galaxy orbits in order to reproduce the observed decline in velocity dispersion with radius. A central minimum in the dispersion profile can also be modelled if there is a circularization of orbits in the cluster core. More general models where the M/L is allowed to vary with radius have been additionally constrained using the emissivity profile of the hot X-ray gas in the cluster to derive plausible distributions for the dark matter.

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