Constraining omega and bias from the Stromlo-APM survey

Conference · Mon May 01 04:00:00 EDT 1995

OSTI ID:105691

Loveday, J

Galaxy redshift surveys provide a distorted picture of the universe due to the non-Hubble component of galaxy motions. By measuring such distortions in the linear regime one can constrain the quantity {beta} = {Omega}{sup 0.6} where {Omega} is the cosmological density parameter and b is the (linear) bias factor for optically-selected galaxies. In this paper we estimate {beta} from the Stromlo-APM redshift survey by comparing the amplitude of the direction-averaged redshift space correlation function to the real space correlation function. We find a 95% confidence upper limit of {beta} = 0.75, with a `best estimate` of {beta} {approx} 0.48. A bias parameter b {approx} 2 is thus required if {Omega} {equivalent_to} 1. However, higher-order correlations measured from the APM galaxy survey indicate a low value for the bias parameter b {approx} 1, requiring that Q {approx_lt} 0.6.

• Research Organization: Fermi National Accelerator Lab., Batavia, IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States); European Economic Community, Brussels (Belgium)
• DOE Contract Number: AC02-76CH03000
• OSTI ID: 105691
• Report Number(s): FNAL/C--95/120; CONF-9503158--16; ON: DE95015166
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CORRELATION FUNCTIONS
COSMOLOGICAL MODELS
GALAXIES
MOTION
RED SHIFT