Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.308q&link_type=abstract
Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:
Astronomy and Astrophysics
Astrophysics
Scientific paper
We calculate the expected number of multiply-imaged galaxies in the Hubble Deep Field (HDF), using photometric redshift information for galaxies with m_I < 27 that were detected in all four HDF passbands. A comparison of these expectations with the observed number of lensed sources in the HDF places a 95% confidence lower limit on the current value of Omega_m - Omega_Lambda between -0.17, if there are no strongly lensed sources in the HDF, and -0.59, if there are three strongly lensed sources in the HDF. For a flat universe, Lambda < 0.58 to 0.79. If the only lensed source in the HDF is the one presently viable candidate, then Omega_m - Omega_Lambda > -0.39. These lower limits are compatible with estimates based on high redshift supernovae and with previous limits based on gravitational lensing.
Cooray Asantha R.
Miller Michael Coleman
Quashnock Jean M.
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