Physics – Optics
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...313...28b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 313, Feb. 1, 1987, p. 28-36. Research supported by the Exxon Education Foun
Physics
Optics
22
Astronomical Models, Gravitational Lenses, Quasars, Cosmology, Density Distribution, Galactic Structure, Geometrical Optics
Scientific paper
The quasars 1146 + 111 B, C have been claimed to be gravitationally lensed images of a single object. Lenses formed by a singular potential such as a string or black hole can be rejected because they would multiply image other quasars in the field. It is argued that a lensing potential well would have to be almost circularly symmetric and very soft. Furthermore, the observed overdensity of quasars in the field of 1146 + 111 B, C can be explained only if the counts of quasars at B over 22 mag exceed current estimates of a factor of more than 5. Elongated images of background galaxies tracing out the critical lines of the lens should be observable. Non-Gaussian density fluctuations would be necessary to reconcile the existence of a lens of this type with the smoothness of the microwave background. Unless independent evidence for these effects is forthcoming, the intepretation of this object as a gravitational lens is unlikely to be correct.
Blandford Roger. D.
Narayan Ramesh
Phinney Sterl E.
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