Global 8.4-GHz VLBI observations of JVAS B0218+357

Simple item page
dc.creatorBiggs, A. D.
dc.creatorWucknitz, O.
dc.creatorPorcas, R. W.
dc.creatorBrowne, I. W. A.
dc.creatorJackson, N. J.
dc.creatorMao, S.
dc.creatorWilkinson, P. N.
dc.date2002-09-10
dc.date.accessioned2026-07-07T06:30:43Z
dc.date.available2026-07-07T06:30:43Z
dc.descriptionIn this paper we present new observations of the gravitational lens system JVAS B0218+357 made with a global VLBI network at a frequency of 8.4 GHz. Our maps have an rms noise of 30 microJy/beam and with these we have been able to image much of the extended structure of the radio jet in both the A and B images at high resolution (~1 mas). The main use of these maps will be to enable us to further constrain the lens model for the purposes of H0 determination. We are able to identify several sub-components common to both images with the expected parity reversal, including one which we identify as a counter-jet. We have not been successful in detecting either the core of the lensing galaxy or a third image. Using a model of the lensing galaxy we have back-projected both of the images to the source plane and find that they agree well. However, there are small, but significant, differences which we suggest may arise from multi-path scattering in the ISM of the lensing galaxy. We also find an exponent of the radial mass distribution of approximately 1.04, in agreement with lens modelling of published 15-GHz VLBI data. Polarisation maps of each image are presented which show that the distributions of polarisation across images A and B are different. We suggest that this results from Faraday rotation and associated depolarisation in the lensing galaxy.
dc.description10 pages, 5 figures, accepted for publication in MNRAS
dc.identifierhttps://arxiv.org/abs/astro-ph/0209182
dc.identifierhttp://arxiv.org/abs/astro-ph/0209182
dc.identifierMon.Not.Roy.Astron.Soc. 338 (2003) 599
dc.identifierdoi:10.1046/j.1365-8711.2003.06050.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/98409
dc.subjectAstrophysics
dc.titleGlobal 8.4-GHz VLBI observations of JVAS B0218+357
dc.typetext

Files

Collections

arXiv