Is the Coma cluster a Zel'dovich disk

Details Is the Coma cluster a Zel'dovich disk Is the Coma cluster a Zel'dovich disk

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...220..809t&link_type=abstract

Astrophysical Journal, Part 1, vol. 220, Mar. 15, 1978, p. 809-815.

Astronomy and Astrophysics

Astrophysics

42

Astronomical Models, Galactic Clusters, Galactic Evolution, Luminous Intensity, Red Shift, Spatial Distribution

Scientific paper

The two-dimensional structure of the Coma cluster is analyzed with the use of galaxies from a wide-area redshift survey. Since redshift observations allow cluster galaxies to be sorted from foreground and background galaxies, the cluster structure can be traced accurately to large radii. The following results have been obtained: (1) the center of mass of the Coma cluster is coincident with NGC 4874, the brightest S0 (or cD) galaxy; (2) the cluster has an elliptical shape with an axial ratio of 0.55 and position angle 67 deg; (3) there is a sharp falloff in the distribution of bright galaxies at a radius of approximately 3.1 deg; and (4) the radial distribution of galaxies contains a slight secondary maximum at a radius or approximately 1.4 deg. The observations are used to show that the cluster may be composed of two components, a central spherical core plus a more widely dispersed flattened disk. It is suggested that the observed structure of Coma can be consistently explained using the model of Doroshkevich, Sunyaev, and Zel'dovich (1974) which involves the formation of massive protoclusters prior to the epoch of galaxy formation.

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