Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.243..192n&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 243, March 15, 1990, p. 192-198.
Astronomy and Astrophysics
Astronomy
40
Bl Lacertae Objects, Gravitational Lenses, Dark Matter, Gravitational Fields, Luminosity, Red Shift, Very Long Base Interferometry
Scientific paper
Noteworthy constraints are presently obtained on foreground galaxies, which have recently been found to be superposed on several high-z BL Lac objects, in view of the fact that the BL Lac objects are not multiply imaged as a result of gravitational lensing. Lower limits are derived for the core radius of each galaxy from its observed angular separation from the BL Lac object, together with an assumed redshift and velocity dispersion of the galaxy. An analysis is conducted for a circularly symmetric galaxy model, as well as for the case in which there is an external symmetry-breaking shear. These theoretical results are applied to the BL Lac objects AO 0235 + 164 and PKS 0537 - 441, for which this galaxy-superposition has been observed.
Narayan Ramesh
Schneider Pat
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