Lensing of extended sources by dark galactic halos

Details Lensing of extended sources by dark galactic halos Lensing of extended sources by dark galactic halos

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97..327n&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 97, Feb. 1989, p. 327-335.

Astronomy and Astrophysics

Astronomy

19

Dark Matter, Gravitational Lenses, Radio Sources (Astronomy), Background Radiation, Brightness Distribution, Density Distribution, Image Analysis, Lyman Alpha Radiation, Very Long Base Interferometry

Scientific paper

Gravitational lensing is discussed with respect to background source imaging and the role of dark matter as a lensing agent. The observed features of the lens systems 2016+112, 0023+171, 2345+007, and 1635+267 are well reproduced by models that consist of normal galaxies accompanied by galactic halos of size 75-150 kpc and mass 1-2 x 10 to the 13th solar masses. It is shown that the image features resulting from the lensing of extended sources cannot be reproduced by models which are based only on point sources.

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