Can all quasars be gravitationally lensed Seyfert's nuclei

Details Can all quasars be gravitationally lensed Seyfert's nuclei Can all quasars be gravitationally lensed Seyfert's nuclei

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...118l...1s&link_type=abstract

Astronomy and Astrophysics, vol. 118, no. 1, Feb. 1983, p. L1, L2.

Astronomy and Astrophysics

Astrophysics

4

Galactic Nuclei, Gravitational Lenses, Quasars, Seyfert Galaxies, X Ray Spectra, Cosmology, Spatial Distribution

Scientific paper

The X-ray emission properties of a sample of radio-quiet quasars are used to set a strict upper limit to the fraction of objects which could result from large amplifications due to gravitational lensing. It is shown that no more than 10-20% of the quasars in a flux limited sample can be boosted images of Seyfert 1 type nuclei. It is also shown that this limit adds further evidence to the exclusion of a cosmological density of compact objects in the mass range 1 - 103M_sun;.

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