Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mnras.174...91s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 174, Jan. 1976, p. 91-103.
Astronomy and Astrophysics
Astronomy
8
Background Radiation, Galactic Radiation, Gravitational Lenses, Images, Quasars, Radiation Sources, Emission Spectra, Hubble Diagram, Light (Visible Radiation), Luminous Intensity, Radio Sources (Astronomy)
Scientific paper
Observational evidence for the production of a weak secondary lens image of a background source by a gravitational deflector is investigated. Five quasars which exhibit evidence of intervening galaxies are chosen as possible candidates for lensed background sources; these include 3C 196, 3C 286, 3C 287, 3C 268.4, and PHL 938. Equations and assumptions are outlined which enable estimates to be made of the likelihood that a secondary lens image would be visible. Analysis of observational data on the five candidate quasars indicates that 3C 268.4 should show a visible secondary lens image. Observational proof for this effect is proposed, and it is suggested that a photograph of PHL 938 taken down to a limiting magnitude of about 23 might exhibit a visible secondary lens image.
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