Cosmological Constraints From Tully Fisher Measurements In The Local Universe

Details Cosmological Constraints From Tully Fisher Measurements In The Local Universe Cosmological Constraints From Tully Fisher Measurements In The Local Universe

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.9110h&link_type=abstract

American Astronomical Society, AAS Meeting #211, #91.10; Bulletin of the American Astronomical Society, Vol. 39, p.885

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We compare the cosmological implications of recent cluster peculiar velocity measurements, using a new Tully Fisher template in the SFI++ survey, at z < 0.33. The measurements suggest a cosmological, intrinsic cluster velocity dispersion of 256 +54/-45; km/s, consistent with previous measurements from Watkins (1997, RMAS, 292, L59). We find that the data best constrain the combination σ8Ωm0.45 to be 0.5299 ± 0.1285. For a ΛCDM scenario, the cluster velocity dispersion data is entirely consistent with WMAP constraints. This is consistent with complementary large-scale structure measurements of σ8 and Ωm with slightly different degeneracy directions.
NH's work is supported by the National Science Foundation Research Experience for Undergraduates Program NSF AST-0552387. RB's work is supported by NSF grants AST-0607018 and PHY-0555216.

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