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Constraints on Cosmological Models from Cosmic Flows

Published online by Cambridge University Press:  26 May 2016

Michael J. Hudson
Affiliation:
1Dept. of Physics, Univ. of Waterloo
Russell J. Smith
Affiliation:
2Departamento de Astronomía y Astrofísica, P. Univ. Católica de Chile
John R. Lucey
Affiliation:
3Dept. of Physics, Univ. of Durham
David J. Schlegel
Affiliation:
4Dept. of Astrophysical Sciences, Princeton University
Roger L. Davies
Affiliation:
3Dept. of Physics, Univ. of Durham

Extract

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The SMAC cluster sample (Hudson et al. 1999), with a depth of ˜ 12000km s-1, has a bulk velocity of ˜ 600 km s-1, with respect to the Cosmic Microwave Background (CMB) frame. Other surveys (Willick 1999, hereafter LP10k; Lauer & Postman 1994, hereafter ACIF) have also yielded large bulk motions on similarly large scales. Taken at face value, these results appear to be in conflict with bulk flows expected from favoured cosmological models. However, at the same time, other surveys (notably Dale et al. 1999, hereafter SC) have found rather small bulk motions on large scales. We have measured bulk flows from the above mentioned surveys plus SNIa (Riess et al. 1995) in a consistent way. The results are given in Table 1. The measurement errors are due to peculiar velocity errors. Note that these are the errors typically quoted. Based on these errors alone, there appears to be conflict between some of the surveys (e.g. SC vs SMAC).

Type
Part XII: Poster Papers
Copyright
Copyright © Astronomical Society of the Pacific 2005 

References

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