Volume 403, Number 1, May III 2003
|Page(s)||73 - 81|
|Published online||29 April 2003|
The multiplicity function of galaxies
INAF - Osservatorio Astronomico di Capodimonte, Via Moiariello 16, 80131 Napoli, Italy
2 Astrophysics Research Institute, Liverpool John Moores University, Egerton Wharf, Twelve Quays House, Birkenhead CH41 1LD, UK
3 Università di Napoli Federico II, via Cinthia, 80126 Napoli, Italy
4 INAF – Osservatorio Astronomico di Brera, via Brera 28, 20121 Milano, Italy
5 Department of Physics and Astronomy, Johns Hopkins University, Baltimore – MD, USA
Corresponding author: E. Puddu, firstname.lastname@example.org
Accepted: 4 February 2003
The multiplicity function (MF) of groups and clusters of galaxies is determined using galaxy catalogues extracted from a set of Digitized Palomar Sky Survey (DPOSS) plates. The two different types of structures (of low and high richness) were identified using two different algorithms: a modified version of the van Albada method for groups, and a peak finding algorithm for larger structures. In a 300 deg2 area up to , we find 2944 groups and 179 clusters. Our MF covers a wide range of richnesses, from 2 to 200, and the two MFs derived by the two algorithms match smoothly without the need for additional conditions or normalisations. The resulting multiplicity function, of slope , strongly resembles a power law.
Key words: galaxies: clusters: general / galaxies: general
© ESO, 2003
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