Luminosity Function of The Galaxy Cluster Abell 85

Using the photometric and spectroscopic data from the NASA/IPAC Extragalactic Database (NED) and the Eighth Data Release of Sloan Digital Sky Survey (SDSS-DR8), we have studied the luminosity function (LF) of the galaxy cluster Abell 85 within the double dynamical radius 2r200. It is shown that the LF of Abell 85 can be fitted very well with a Schechter function in all the 5 SDSS wavebands, and that the LF exhibits a dip in the u, g, and z bands, respectively. The best-fitting parameters (the characteristic absolute magnitude in the r band and the slope at the faint end of the LF) of the Schechter function are mag, and for the early-type galaxies, mag, and for the late-type galaxies, respectively. The LF of early-type galaxies shows a dip at mag. ition, we have also investigated the LFs in the three concentric annuli within 1.5r200, and found that the closer the distance from the cluster center, the steeper the faint-end slope, and the brighter the characteristic magnitude.