This assignment is meant to help you better understand the role of free parameters in the Galaxy Luminosity Function. Generate three separate plots for the questions below. The plots should have log(L) on the X-axis and log (Phi) on the Y-axis.
(1) For Phi* = 0.015 h^3 Mpc^-3, M* - 5 log(h) = -20.5, and faint end slopes of -0.5, -1.0, -1.5. You have to make all three LF plots on the same graph. (2) For Phi* = 0.015 h^3 Mpc^-3, faint end slope of -1.0, and M* - 5 log(h) = -18.5, -20.5, -22.5. You have to make all three LF plots on the same graph. (3) Faint end slope of -1.0, M* - 5 log(h) = -20.5, and Phi* = 0.045, 0.015, 0.005 h^3 Mpc^-3. You have to make all three LF plots on the same graph. Your report should include a discussion on what you infer from the plots.
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This assignment involves some analysis on the galaxy cluster Abell 2255. An SDSS image of the cluster is shown below. The cluster core has coordinates of RA = 258.1292 deg, Dec = 64.0925 deg. The data on member galaxies of the cluster can be downloaded from here : ABELL2255
The separate columns (comma separated values) in the data file are as follows:
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March 2017
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