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Date and Time of the Query: 2019-07-16 T19:17:20 PDT
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For refcode 2000A&A...356..435N:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2000A&A...356..435N The luminosity function of MS 2255.7+2039 at z=0.288. NAESLUND M., FRANSSON C., HULDTGREN M. Received 1 July 1999 / Accepted 11 February 2000 Abstract. The luminosity function of MS 2255.7+2039 at z=0.288 is determined down to a total magnitude of R~24, corresponding to M_R_ ~ -17 (H_0_ = 50km s^-1^ 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 M_R_ ~ -19. After corrections for light loss and crowding, the data can be described by a sum of two Schechter functions, one with M_R_^*^ = -22.8 and {alpha} = -1.0, and one steeper with M_R_^*^ = -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 MS 2255.7+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. Key words: galaxies: clusters: general - galaxies: clusters: individual: MS 2255.7+2039 - galaxies: evolution - galaxies: formation - galaxies: luminosity function, mass function - cosmology: observations
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