Are some BL Lac objects artefacts of gravitational lensing?

Details Are some BL Lac objects artefacts of gravitational lensing? Are some BL Lac objects artefacts of gravitational lensing?

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.318..446o&link_type=abstract

Nature (ISSN 0028-0836), vol. 318, Dec. 5, 1985, p. 446-448.

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Bl Lacertae Objects, Gravitational Lenses, Quasars, Computational Astrophysics, Galactic Nuclei, Luminosity, Magnitude, Red Shift

Scientific paper

BL Lac objects are extragalactic, highly variable, polarized sources with significant emission from radio to X-ray wavelengths. However, despite extensive research, their nature and origin remain unclear. The authors propose that a significant fraction of the BL Lac objects are optically violently variable quasars (OVVs) whose continuum emission has been greatly amplified, relative to the line emission, by point-like gravitational lenses (either stars or black holes) in intervening galaxies. Several anomalous physical and statistical properties of BL Lacs can be understood on the basis of this model, which is immediately testable on the basis of absorption line studies and by direct imaging.

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