Milliarcsec-scale polarisation observations of the gravitational lens B1422+231

Details Milliarcsec-scale polarisation observations of the gravitational lens B1422+231 Milliarcsec-scale polarisation observations of the gravitational lens B1422+231

1999-05-25

arxiv.org/abs/astro-ph/9905311v1

Astronomy and Astrophysics

Astrophysics

5 pages, LaTeX, 6 figures, uses psfig.sty and rotate.sty. MNRAS Letter (accepted)

Scientific paper

10.1046/j.1365-8711.1999.02813.x

We present polarisation observations of the gravitational lens system B1422+231 made at 8.4 GHz using the VLBA and the 100m telescope at Effelsberg. All four images of the quasar show structure on the milliarcsec scale. The three bright images show tangential stretching as expected from lens models. Some basic properties of gravitational lensing are exhibited by this system. The surface brightness of images A and B are the same and the parity reversal expected in image B is revealed, for the first time, by polarisation observations. There is a large differential Faraday rotation between images A and B.

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