Book section
Measuring Ω with Galaxy Streaming Velocities
- Abstract:
- The mean pairwise velocity of galaxies has traditionally been estimated from the redshift space galaxy correlation function. This method is notorious for being highly sensitive to the assumed model of the pairwise velocity dispersion. Here we propose an alternative method to estimate the streaming velocity directly from peculiar velocity samples, which contain redshift-independent distances as well as galaxy redshifts. This method can provide an estimate of $\Omega^{0.6}\sigma_8^2$ for a range of $\sigma_8$ where $\Omega$ is the cosmological density parameter, while $\sigma_8$ is the standard normalization for the power spectrum of density fluctuations. We demonstrate how to measure this quantity from realistic catalogues and identify the main sources of bias and errors
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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- Files:
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(Preview, Accepted manuscript, pdf, 130.2KB, Terms of use)
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- Publisher copy:
- 10.1142/9789814528818
Authors
- Publisher:
- World Scientific
- Host title:
- New Worlds in Astroparticle Physics: Proceedings of the International Workshop
- Publication date:
- 1999-04-06
- DOI:
- Pubs id:
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pubs:208141
- UUID:
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uuid:1f83c5c3-3ba8-4aa8-be5a-270e46f11154
- Local pid:
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pubs:208141
- Source identifiers:
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208141
- Deposit date:
-
2012-12-19
- ARK identifier:
Terms of use
- Copyright date:
- 1999
- Notes:
- Proceedings of New Worlds in Astroparticle Physics, 6 pages, 2 figures This is an author version of the chapter. The final version is available online from the publisher’s website.
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