The Hydra I cluster of galaxies - A unique case of membership definition

Details The Hydra I cluster of galaxies - A unique case of membership definition The Hydra I cluster of galaxies - A unique case of membership definition

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...111..193r&link_type=abstract

Astronomy and Astrophysics, vol. 111, no. 1, July 1982, p. 193-200.

Astronomy and Astrophysics

Astrophysics

53

Galactic Clusters, Radial Velocity, Red Shift, X Ray Sources, Astronomical Spectroscopy, Density Distribution, Galactic Rotation, Galactic Structure, Luminosity, Mass To Light Ratios, Virgo Galactic Cluster

Scientific paper

New optical radial velocities for 71 galaxies in the Hydra I cluster are presented. The recession velocity of the cluster is determined to 3425 km/sec, yielding a distance of about 45.7 Mpc. The overall velocity dispersion is 676 km/sec. Results of galaxy counts could be fitted by a two-component model. Many of the global cluster properties of Hydra I like, e.g., total galaxy content, velocity dispersion, X-ray flux, etc., suggest a remarkable similarity with the Virgo cluster. No foreground galaxies and no background galaxies were noted in the observed area up to about 8000 km/sec, suggesting regions of empty space of the order of 40-50 Mpc extent along the line of sight.

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