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Issue A&A
Volume 436, Number 1, June II 2005
Page(s) 17 - 24
Section Cosmology (including clusters of galaxies)
DOI http://dx.doi.org/10.1051/0004-6361:20042385



A&A 436, 17-24 (2005)
DOI: 10.1051/0004-6361:20042385

Environmental enhancement of DM haloes

M. Einasto1, I. Suhhonenko1, 2, P. Heinämäki1, 2, J. Einasto1 and E. Saar1

1  Tartu Observatory, 61602 Tõravere, Estonia
    e-mail: maret@aai.ee
2  Tuorla Observatory, Väisäläntie 20, Piikkiö, Finland

(Received 18 November 2004 / Accepted 7 February 2005 )

Abstract
We study the properties of dark matter haloes of a LCDM model in different environments. Using the distance of the 5th nearest neighbour as an environmental density indicator, we show that haloes in a high density environment are more massive, richer and have larger radii and larger velocity dispersions than haloes in a low density environment. Haloes in high density regions move with larger velocities, and are more spherical than haloes in low density regions. In addition, low mass haloes in the vicinity of the most massive haloes are themselves more massive, larger and have larger rms velocities and larger 3D velocities than low mass haloes far from massive haloes. The velocities of low mass haloes near massive haloes increase with the parent halo mass. Our results are in agreement with recent findings about environmental effects for groups and clusters of galaxies from deep (SDSS and LCRS) surveys.


Key words: cosmology: large-scale structure of Universe -- methods: numerical -- methods: N-body simulations




© ESO 2005


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