Dwarf galaxies at z=0.2: photometry of the cluster Abell 963

SP Driver, S Phillipps, JI Davies, I Morgan, MJ Disney

Research output: Contribution to journalArticle (Academic Journal)peer-review

Abstract

Most models devised to account for the excess galaxies seen in number magnitude counts invoke a large population of low-luminosity galaxies at moderate redshifts (or look-back times). Here we directly investigate the faint end of the luminosity function at moderate z (congruent-to 0.2) via deep R-band observations of the distant Abell cluster A963 made with the Hitchhiker parallel CCD camera on the WHT. By subtracting a 'mean field' component from the observed galaxy counts in the cluster area, we deduce the existence of a large dwarf population in the cluster, which gives rise to a significant excess over the mean, right down to the sample limit at m(R) congruent-to 24.5 (M(R) congruent-to - 16.5). The implied dwarf-galaxy luminosity function has a steep slope, alpha approximately - 1.8, in line with recent work on nearby clusters.

Original languageEnglish
Pages (from-to)393-404
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume268
Issue number2
Publication statusPublished - 15 May 1994

Keywords

  • TECHNIQUES, IMAGE PROCESSING
  • GALAXIES, CLUSTERS, INDIVIDUAL, A963
  • GALAXIES, DISTANCES AND REDSHIFTS
  • GALAXIES, LUMINOSITY FUNCTION, MASS FUNCTION
  • GALAXIES, PHOTOMETRY
  • SURFACE BRIGHTNESS GALAXIES
  • REDSHIFT SURVEY
  • LUMINOSITY FUNCTION
  • FAINT GALAXIES
  • EVOLUTION
  • POPULATION
  • CATALOG
  • COUNTS

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