Physics, 22.02.2020 03:54, UltimateGoal

The Virgo cluster is a fairly nearby cluster of ~2000 galaxies. The distance of the Virgo cluster is 16 Mpc and its bulk radial velocity is approximately 1120 km/s. The cluster is very large on the sky, its angular ‘core radius’ is approximately 6.5 degrees! a)(5 pts) If ~2.2% of Virgo galaxies have negativeradial velocities, what is the approximate mass of the cluster?

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