M.A. Garrett , S. Nair , R.W. Porcas , A.R. Patnaik
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Multi-epoch VLBA 15 and 43 GHz observations of the gravitational lens PKS 1830-211: Extending VLBI towards the micro-arcsecond scale
We present multi-epoch, VLBA maps of PKS 1830-211 at 15 and 43 GHz. The 43 GHz observations reveal complicated submilliarcsecond radio structure in the cores of both lensed images. This structure appears to change dramatically between the two epochs (separated by 44 days). One explanation for these unusually rapid structural changes is that the lens magnifies each image, such that the nominal submilliarcsecond scale of these maps is enhanced by a factor of between 5 and 10—effectively boosting our resolution towards the micro-arcsecond scale.
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