An unbiased value of {OMEGA} from cluster infall and gravitational lensing.
Abstract
We combine various methods to derive an unbiased value of the cosmological density parameter {OMEGA}. We consider the analysis of redshift-space envelopes of infall patterns around rich clusters of galaxies and estimates of the cluster mass at large radii from gravitational lensing. We estimate the uncertainty in the value of {OMEGA} taking into account the imperfect separation of the background, the elongation of the cluster and the resolution of imaging gravitational lensing. Future observations using the Hubble Space Telescope will constrain {OMEGA} using this method.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- April 1996
- Bibcode:
- 1996A&A...308..368R
- Keywords:
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- COSMOLOGY: THEORY;
- COSMOLOGY: DARK MATTER;
- COSMOLOGY: GRAVITATIONAL LENSING