Mathematics – Logic
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.268l..23c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 268, NO. 1/MAY1, P. L23, 1994
Mathematics
Logic
44
Scientific paper
We determine the distribution of peculiar velocities of galaxy clusters in two competing cosmological scenarios: a spatially flat, low-density, cold dark matter universe with cosmological density parameter {OMEGA} = 0.2 and a cosmological constant {DELTA} = 3H_0_^2^(1 - {OMEGA}) (LCDM); and an {OMEGA} = 1 universe containing a mixture of hot and cold dark matter (MDM). Although the spatial clustering properties of clusters in the two models are almost identical, the rms cluster peculiar velocities in the MDM universe are substantially higher. We compare the theoretical peculiar velocity distributions with observations and find that both models have difficulties in reproducing the observed distribution of cluster peculiar velocities. The reliable detection of several more clusters with peculiar velocities greater than 1000 km s^-1^ would be difficult to reconcile with the models, particularly LCDM.
Croft Rupert A. C.
Efstathiou George
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