Changes in the angular separation of the lensed images PKS 1830-211 NE & SW

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dc.creatorChengjin, Jin
dc.creatorGarrett, M. A.
dc.creatorNair, S
dc.creatorPorcas, R. W.
dc.creatorPatnaik, A. R.
dc.date1999-06-03
dc.date.accessioned2026-07-07T02:31:49Z
dc.date.available2026-07-07T02:31:49Z
dc.descriptionWe present 8 epochs of 7 mm dual-polarization VLBA observations of the gravitational lens system PKS 1830-211 made over the course of 14 weeks. Clear changes in the relative positions of the cores of up to $80 μ$arcseconds ($μ$as) were observed between epochs (each separated by $\approx 2$ weeks). A comparison with previous 7 mm VLBA maps shows that the separation of the cores has changed by almost $280 μ$as over 12 months. This leads us to conclude that changes in the brightness distribution of the mm-VLBI core of the background source must be occurring rapidly. This is the first clear observation of significant radio source evolution in a gravitational lens system. It is also the first time that changes in source structure have been detected in a distant extra-galactic source on such short time-scales. This is partly accounted for by the magnification provided by the lens system.
dc.description6 pages, 2 figures; Accepted New Astronomy Reviews (EVN/JIVE Symposium No 4, Special edition)
dc.identifierhttps://arxiv.org/abs/astro-ph/9906061
dc.identifierhttp://arxiv.org/abs/astro-ph/9906061
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/14292
dc.subjectAstrophysics
dc.titleChanges in the angular separation of the lensed images PKS 1830-211 NE & SW
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