| The Mass Profile Of The Coma Galaxy Cluster (2007) | |||||||||||||
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| We use a new redshift survey complete to mR ' 15:4 within 4:25 o from the center of the Coma cluster to measure the mass profile of the cluster to r 5:5h \Gamma1 Mpc. We extend the profile to r 10h \Gamma1 Mpc with a further sample complete to mR = 15:4 in 42% of the area within a 10 ffi radius and to mZw = 15:5 in the remaining area. Galaxies within this region are falling onto the cluster on moderately radial orbits and thus do not satisfy virial equilibrium. Nonetheless, identification of the caustics in redshift space provides an estimate of the gravitational potential at radius r and hence of the system mass, M( 10h \Gamma1 Mpc) = (1:65 \Sigma 0:41) \Theta 10 15 h \Gamma1 M fi (1-oe error). Previous mass estimates derived from optical and X-ray observations are limited to r 2:5h \Gamma1 Mpc. Our mass profile is consistent with these estimates but extends to distances four times as large. Over the entire range, the mass increases with r at the rate expe... | |||||||||||||
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