An unbiased value of {OMEGA} from cluster infall and gravitational lensing.

Details An unbiased value of {OMEGA} from cluster infall and gravitational lensing. An unbiased value of {OMEGA} from cluster infall and gravitational lensing.

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...308..368r&link_type=abstract

Astronomy and Astrophysics, v.308, p.368-372

Astronomy and Astrophysics

Astrophysics

1

Cosmology: Theory, Cosmology: Dark Matter, Cosmology: Gravitational Lensing

Scientific paper

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.

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