Is the Coma cluster a Zel'dovich disk

Abstract

view Abstract Citations (45) References (33) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Is the Coma cluster a Zel'dovich disk? Thompson, L. A. ; Gregory, S. A. Abstract 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. Publication: The Astrophysical Journal Pub Date: March 1978 DOI: 10.1086/155969 Bibcode: 1978ApJ...220..809T Keywords: Astronomical Models; Galactic Clusters; Galactic Evolution; Luminous Intensity; Red Shift; Spatial Distribution; Astrophysics; Clusters of Galaxies:Coma; Clusters of Galaxies:Galaxy Distribution; Clusters of Galaxies: Structure full text sources ADS | data products SIMBAD (3)