The peculiar velocity function of galaxy clusters
Feb, 199618 pages
Published in:
- Astrophys.J.Lett. 462 (1996) L49
e-Print:
- astro-ph/9602149 [astro-ph]
DOI:
Report number:
- POPE-658
View in:
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Abstract: (arXiv)
The peculiar velocity function of clusters of galaxies is determined using an accurate sample of cluster velocities based on Tully-Fisher distances of Sc galaxies (Giovanelli et al 1995b). In contrast with previous results based on samples with considerably larger velocity uncertainties, the observed velocity function does not exhibit a tail of high velocity clusters. The results indicate a low probability of \,5\% of finding clusters with one-dimensional velocities greater than 600 {\kms}. The root-mean-square one-dimensional cluster velocity is 29328 {\kms}. The observed cluster velocity function is compared with expectations from different cosmological models. The absence of a high velocity tail in the observed function is most consistent with a low mass-density (0.3) CDM model, and is inconsistent at level with = 1.0 CDM and HDM models. The root-mean-square one-dimensional cluster velocities in these models correspond, respectively, to 314, 516, and 632 {\kms} (when convolved with the observational uncertainties). Comparison with the observed RMS cluster velocity of 29328 {\kms} further supports the low-density CDM model.References(27)
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