Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-10-19
Astronomy and Astrophysics
Astrophysics
4 pages with 3 embedded ps figures; uses emulateapj.sty (included). Accepted for publication in ApJ Letters
Scientific paper
10.1086/312404
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 $\beta = \Omega^{0.6}/b$, where $b$ is the linear bias. We find $\beta_I=0.42^{+0.10}_{-0.06}$ and $\beta_O=0.26\pm0.08$ for the IRAS and ORS comparisons, respectively, and $H_0=74\pm4$ \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 $\beta$, 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 $\beta$ continues.
Ajhar Edward A.
Blakeslee John P.
Davis Martin
Dressler Alan
Tonry John L.
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