Omega and Biasing from Optical Galaxies vs. POTENT Mass

Details Omega and Biasing from Optical Galaxies vs. POTENT Mass Omega and Biasing from Optical Galaxies vs. POTENT Mass

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...18511905h&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #119.05; Bulletin of the American Astronomical Society, Vol. 26, p.1517

Astronomy and Astrophysics

Astronomy

Scientific paper

The mass density field in the local universe, recovered by the POTENT method from peculiar velocities of ~ 3000 galaxies, is compared with the density field of optically-selected galaxies, both smoothed with a Gaussian filter of radius 12 h(-1) Mpc. Under the assumptions of gravitational instability and a linear biasing parameter b_O between optical galaxies and mass, we obtain from a regression of POTENT density on optical density, corrected for systematic biases in the velocity data and POTENT method, beta_O equiv Omega (0.6) /b_O = 0.74 +/- 0.13. The error quoted is just the 1sigma formal error estimated from the observed scatter in the density--density scatterplot; it does not include the uncertainty due to cosmic scatter in the mean density or in the biasing relation. We do not attempt a formal analysis of the goodness of fit, but the scatter about the fit is consistent with our estimates of the uncertainties.

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