Star disturbances in gravitational lens galaxies

Details Star disturbances in gravitational lens galaxies Star disturbances in gravitational lens galaxies

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...132..168c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 132, no. 1, March 1984, p. 168-178. Sponsorship: Deutsche Forschungsgemeinscha

Astronomy and Astrophysics

Astrophysics

162

Cosmology, Galaxies, Gravitational Lenses, Light Curve, Stellar Gravitation, Gravitational Effects, Quasars

Scientific paper

Image splitting and flux changes caused by a single star in an extended gravitational lens galaxy are investigated. Earlier investigations (Chang and Refsdal, 1979) showed that an image can split into two or four sub-images. The authors here find, by a more general investigation, that the number of sub-images in some cases can be zero, so that one of the gravitational lens images of the equivalent "smoothed out" galaxy disappears completely due to the inhomogeneity represented by a star (or a globular cluster). The missing third image in the double QSO 0957+561 A, B may be due to this effect.

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