Wide triplets of galaxies: collapse on spatial scales of ~1Mpc

Details Wide triplets of galaxies: collapse on spatial scales of ~1Mpc Wide triplets of galaxies: collapse on spatial scales of ~1Mpc

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.319..851c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 319, Issue 3, pp. 851-859.

Astronomy and Astrophysics

Astronomy

2

Galaxies: Clusters: General

Scientific paper

We study triple systems of galaxies with mean projected harmonic separation ~=0.6h-1Mpc σR[(1/3)Σ(νK - (ν))2] 1/2, k = 1,2,3. We call the systems `wide triplets', in contrast to compact triplets with mean projected harmonic separation ~=0.04h-1Mpc, studied by Karachentsev et al. Data are taken for 108 wide triplets from a list compiled by Trofimov & Chernin; at least one-third of them are considered to be probably isolated physical systems. With typical crossing times of about the Hubble time, the wide triplets seem to be in a state of ongoing collapse. This is confirmed by a set of computer models which simulate well the observational characteristics of the ensemble of wide triplets. The simulations also give a statistical estimate of the total mass of a typical wide triplet: it proves to be ~=1013Msolar. This figure indicates that the dark matter mass is 15-30 times the mass of baryonic matter in the systems. The dynamics of wide triplets, as well as their dark matter content, provide new direct cosmological constraints by establishing that hierarchical evolution is occurring on a mass scale of ~1013Msolar and a spatial scale of ~1Mpc.

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