The Luminosity Function of MS2255.7+2039 at z=0.288
Abstract
The luminosity function of MS2255.7+2039 at z=0.288 is determined down to a total magnitude of R ~ 24, corresponding to MR ~ -17 (H0 = 50 km/s/Mpc). The data are corrected for incompleteness and crowding using detailed simulations. We find that the luminosity function is steeper than a standard Schechter function at faint magnitudes, and shows an excess of galaxies below MR ~ -19. After corrections for light loss and crowding, the data can be described by a sum of two Schechter functions, one with MR = -22.8 and alpha = -1.0, and one steeper with MR = -18.9 and alpha = -1.5, representing the dwarf population. A straight-line fit to the faint part yields a slope similar to the Schechter alpha = -1.5 of the dwarf population. The luminosity function of MS2255.7+2039 is compared to other clusters at lower redshifts, and does not show any significant difference. The redshift range for clusters in which increased number of dwarf galaxies have been found is therefore extended to higher redshifts.
Turn this paper into a full lesson
ArcXiv compiles a staged curriculum from this paper: 8-12 lessons across beginner → advanced, synthesised section guides, visuals, flashcards, a quiz, exercises, and on-demand deep dives per section. Grounded in the abstract, never invented.