Abstract
The DAO/CFHT image stabilizing camera HRHR-Cam was used to search for closely spaced images resulting from gravitational lensing by foreground galaxies in a sample of 101 bright quasars. No convincing objects were found. Several widely-separated (1 – 6 arc-sec) point source companions were detected but half of these are known to be stars, and it is argued that the remainder are also likely to be stars. A slight excess of galaxy companions to the quasars is found when compared to a control sample of stars, but the difference is not statistically significant (galaxy companions to 17 quasars were found, similar companions were noted around 12 stars).
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References
Fukugita, M. and Turner, E.L. (1991): “Gravitational Lensing Frequencies: Galaxy Cross Sections and Selection Effects”, preprint.
Kochanek, C.S. (1991): “Selection Effects in Optical Surveys for Gravitational Lenses”, preprint.
Surdej, J., et al. (1988): in Proceedings of a Workshop on Optical Surveys for Quasars, ASP Conference Series No.2, eds Osmer et al., p183.
Turner, E., Ostriker, J.P., & Gott, J.R. (1984), Ap. J., 284, 1.
Veron-Cetty, M.-P., & Veron, P., 1987, ESO Scientific Report No. 5
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© 1992 Springer-Verlag
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Crampton, D., McClure, R.D., Fletcher, J.M. (1992). A search for closely-spaced gravitational lenses. In: Kayser, R., Schramm, T., Nieser, L. (eds) Gravitational Lenses. Lecture Notes in Physics, vol 406. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-55797-0_83
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DOI: https://doi.org/10.1007/3-540-55797-0_83
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