Are BL Lac objects too large to be gravitationally lensed?

Details Are BL Lac objects too large to be gravitationally lensed? Are BL Lac objects too large to be gravitationally lensed?

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.349..676g&link_type=abstract

Nature (ISSN 0028-0836), vol. 349, Feb. 21, 1991, p. 676-678.

Astronomy and Astrophysics

Astronomy

14

Astronomical Spectroscopy, Bl Lacertae Objects, Gravitational Lenses, Red Shift, Astronomical Models, Emission Spectra, Stellar Spectra, Very Long Base Interferometry

Scientific paper

BL Lacertae objects are extragalactic sensors with highly, variable, strongly polarized continuum emission and which exhibit little or no line emission. It has been suggested that BL Lacs are optically violent variable (OVV) quasars whose continuum is enhanced relative to the line emission by gravitational lensing due to a star in an intervening galaxy. It is argued here, however, that the spectral similarity of BL Lacs and OVVs over a wide wavelength range can be explained by gravitational lensing only if the continuum-emitting region is small, a requirement that is contradicted by independent observations.

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