In terms of observed Doppler shifts, the virial mass is given by equation (13.52)

Example 18.2 Virial mass of cluster For the Coma cluster we have vrms = 860 km/s and a cluster radius of 6.1 Mpc. Find the virial mass of the cluster.


From equation (18.1) we have

1 X 1049g

0 0

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