A First Comparison of the SBF Survey Distances with the Galaxy Density Field: Implications for H_0 and Omega

J. P. Blakeslee; M. Davis; J. L. Tonry; A. Dressler; E. A. Ajhar

doi:10.1086/312404

paper

A First Comparison of the SBF Survey Distances with the Galaxy Density Field: Implications for H_0 and Omega

arXiv:astro-ph/9910340 · doi:10.1086/312404

Abstract

We compare the peculiar velocities measured in the SBF Survey of Galaxy Distances with the predictions from the density fields of the IRAS 1.2 Jy flux-limited redshift survey and the Optical Redshift Survey (ORS) to derive simultaneous constraints on the Hubble constant $H_{0}$ and the density parameter $β = Ω^{0.6} / b$ , where $b$ is the linear bias. We find $β_{I} = 0.4 2_{- 0.06}^{+ 0.10}$ and $β_{O} = 0.26 \pm 0.08$ for the IRAS and ORS comparisons, respectively, and $H_{0} = 74 \pm 4$ \kmsMpc (with an additional 9% uncertainty due to the Cepheids themselves). The match between predicted and observed peculiar velocities is good for these values of $H_{0}$ and $β$ , and although there is covariance between the two parameters, our results clearly point toward low-density cosmologies. Thus, the unresolved discrepancy between the ``velocity-velocity'' and ``density-density'' measurements of $β$ continues.

4 pages with 3 embedded ps figures; uses emulateapj.sty (included). Accepted for publication in ApJ Letters

A First Comparison of the SBF Survey Distances with the Galaxy Density Field: Implications for H_0 and Omega

Abstract

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