What is the estimated mass of this galaxy cluster

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Question: A different galaxy cluster has galaxies within it whose dispersion in redshift (about their mean redshift) is found from spectroscopic observations to be σz. The mean redshift of all the galaxies is Observing the locations of the galaxies in this cluster, we find that the half-light radius (the radius that encloses half of all the light from the galaxies in the cluster) subtends an angle of θh.

What is the estimated mass of this galaxy cluster? Give your response in solar masses, in scientific notation to one decimal place. (You can assume the peculiar velocity of the cluster as a whole is negligible, i.e. the cluster's mean redshift is obtained with the Hubble flow).

Reference no: EM133613080

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