Statistical Search for Ghost Images in the NVSS

Details Statistical Search for Ghost Images in the NVSS Statistical Search for Ghost Images in the NVSS

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.8501e&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #85.01; Bulletin of the American Astronomical Society, Vol. 29, p.1350

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Scientific paper

Positive values of the cosmological constant, lambda, have been suggested to resolve a number of problems in observational cosmology, incuding the possible discrepancy between stellar ages and the inverse of Hubble's constant. In closed cosmological models with positive lambda, a distant source can produce a "ghost image," an image lying 180 degrees away from the source (Petrosian and Saltpeter, Ap. J., 1968). Previous searches (Solheim, Nature, 1968 and Biraud & Mavrides, A. & A., 1980) have failed to find such ghost images, but were compromised because they did not consider aberration produced by the motion of the earth. We have made a much more intensive search using the recently compiled NVSS catalog and a correction for aberration, and yet have found no evidence for ghost images. Our results constrain values of lambda, and some multiply connected models for the topology of the Universe.

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