New Results on the Coma cluster: Revealing the Primary Component

Abstract

Recent observations of the Coma cluster of galaxies in its central region have provided approximately 250 new redshifts - allowing a good membership criterion to be established for brighter galaxies - and magnitudes for 8000 objects in the same region derived from photometric data complete up to V$_{26.5}$=22.5. A thorough structural study of the galaxy distribution of the cluster galaxies, jointly with an X-ray wavelet analysis, and with a kinematical analysis of the velocity distribution allows us to uncover a primary body of the cluster, with evidence for a velocity gradient.

PostScript, 8 pages with figures, to appear in the proceedings of the workshop "Observational Cosmology: from Galaxies to Galaxy Systems", Sesto-Italy, 4-7 July 1995, in a devoted issue of Astrophysical Letters and Communications