Journal Article

The Norma cluster (ACO3627) – II. The near-infrared <i>K</i><sub><i>s</i></sub>-band luminosity function

R. E. Skelton, P. A. Woudt and R. C. Kraan-Korteweg

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 396, issue 4, pages 2367-2378
Published in print July 2009 | ISSN: 0035-8711
Published online July 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.14905.x
The Norma cluster (ACO3627) – II. The near-infrared Ks-band luminosity function

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A deep Ks-band photometric catalogue of galaxies at the core of the rich, nearby Norma cluster (ACO3627) is presented. The survey covers about 45 × 45 arcmin2 (slightly less than 1/3 Abell radius), which corresponds to ∼0.8 h−270 Mpc2 at the adopted distance (vCMB/H0) of 70 h−170 Mpc of this cluster. The survey is estimated to be complete to a magnitude of . This extends into the dwarf regime, 6 mag below . The catalogue contains 390 objects, 235 of which are classified as likely or definite galaxies and 155 as candidate galaxies. The Ks-band luminosity function (LF) is constructed from the photometric sample, using a spectroscopic subsample to correct for fore and background contamination. We fit a Schechter function with a characteristic magnitude of and faint-end slope of α=−1.26 ± 0.10 to the data. The shape of the LF is similar to those found in previous determinations of the cluster LF, in both optical and near-infrared. The Schechter parameters agree well with those of recent field LFs, suggesting that the shape of both the bright-end and the faint-end slopes are relatively insensitive to environment.

Keywords: galaxies: clusters: individual: Norma cluster (ACO 3627); galaxies: luminosity function, mass function; infrared: galaxies

Journal Article.  9300 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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