The Multiplicity Function of Galaxies

Details The Multiplicity Function of Galaxies The Multiplicity Function of Galaxies

2003-02-06

arxiv.org/abs/astro-ph/0302114v1

Astron.Astrophys. 403 (2003) 73-82

Astronomy and Astrophysics

Astrophysics

10 pages, 10 figures. Accepted by A&A

Scientific paper

10.1051/0004-6361:20030254

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 sq. deg. area up to z<0.2, we find 2944 groups and 179 clusters. Our MF covers a wide range of richnesses, from 2 to 200, and the two MF's derived by the two algorithms match smoothly without the need for additional conditions or normalisations. The resulting multiplicity function, of slope alpha= -2.08 +- 0.07, strongly resembles a power law.

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