Frequency dependent radio structure of the gravitational lens system B0218+357

Details Frequency dependent radio structure of the gravitational lens system B0218+357 Frequency dependent radio structure of the gravitational lens system B0218+357

1998-03-23

arxiv.org/abs/astro-ph/9803264v1

Astronomy and Astrophysics

Astrophysics

5 pages, LaTeX, 3 figures, uses paspconf.sty and psfig.sty. To appear in "Highly Redshifted Radio Lines", eds. C. Carilli, S.R

Scientific paper

We present multi-frequency radio continuum VLBI observations of the gravitational lens system B0218+357 carried out using a global VLBI network and the VLBA. The source has been observed with resolutions from 0.2 milliarcsec to 5 milliarcsec and displays interesting structure. The spectral properties of various components show that the lensed object is a standard flat spectrum radio source which has many self-absorbed components. Based on the flux ratio of the lensed images as a function of frequency we propose a simple model for the background radio source.

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