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A small galaxy is found close in the sky to another, much larger galaxy. The two galaxies are 34 arcminutes apart. Taking spectra of the two galaxies it is observed that the larger one has a radial velocity of 5000 km/s and the smaller one has a radial velocity of 5200 km/s.
Assume that the small galaxy has negligible mass compared to the larger galaxy and that it is in a circular orbit around the larger galaxy.
Estimate the mass of the larger galaxy.
Assume that the small galaxy has negligible mass compared to the larger galaxy and that it is in a circular orbit around the larger galaxy.
Estimate the mass of the larger galaxy.