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

Driver, S. P., Phillipps, S., Davies, Jonathan Ivor, Morgan, I. and Disney, Michael John 1994. Dwarf galaxies at z=0.2: photometry of the cluster Abell: 963. Monthly Notices of the Royal Astronomical Society 268 (2) , pp. 393-404.

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: Wiley
ISSN: 1365-2966
Last Modified: 04 Jun 2017 04:25

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