Dwarf Galaxies at Z=0.2 - Photometry of the Cluster ABELL:963

Details Dwarf Galaxies at Z=0.2 - Photometry of the Cluster ABELL:963 Dwarf Galaxies at Z=0.2 - Photometry of the Cluster ABELL:963

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.268..393d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 268, NO. 2/MAY15, P. 393, 1994

Astronomy and Astrophysics

Astronomy

105

Scientific paper

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 (~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_~24.5(M_R_~ -16.5). The implied dwarf-galaxy luminosity function has a steep slope, α~ -1.8, in line with recent work on nearby clusters.

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