Abstract
In this work we have developed a new way to estimate the mass of galaxy clusters. We present templates of spatial profiles of total galaxy luminosity and number from a low-redshift (z < 0.2) cluster sample, using data from the Millennium Run. After binning clusters in different mass ranges, we produce luminosity and number density profiles for each of the cluster subsamples, using a statistical background subtraction method. This method is inspected and the result shows that the profiles are quite different for different mass bins. We then apply the same procedure to 20 real clusters (also z < 0.2) using data from the Sloan Digital Sky Survey. The mass of these real clusters has been measured to high precision using deep Chandra observations. It also produces different template profiles with different mass bins. Thus these profiles can be used to estimate the mass of an unknown cluster. It will be very useful for large optical/infrared extragalactic surveys.