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Global 8.4-GHz VLBI observations of JVAS B0218+357 | | A. D. Biggs
; O. Wucknitz
; R. W. Porcas
; I. W. A. Browne
; N. J. Jackson
; S. Mao
; P. N. Wilkinson
; | | Date: |
10 Sep 2002 | | Journal: | Mon.Not.Roy.Astron.Soc. 338 (2003) 599 | | Subject: | astro-ph | | Affiliation: | 1,2), O. Wucknitz (3,1), R. W. Porcas , I. W. A. Browne , N. J. Jackson , S. Mao and P. N. Wilkinson ( Jodrell Bank, JIVE, University of Hamburg, MPIfR | | Abstract: | In 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. | | Source: | arXiv, astro-ph/0209182 | | Services: | Forum | Review | PDF | Favorites | |
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