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A New Quadruple Gravitational Lens System: CLASS B0128+437 | | P. M. Phillips
; M. A. Norbury
; L. V. E. Koopmans
; I. W. A. Browne
; N. J. Jackson
; P. N. Wilkinson
; A. D. Biggs
; R. D. Blandford
; A. G. de Bruyn
; C. D. Fassnacht
; P. Helbig
; S. Mao
; D. R. Marlow
; S. T. Myers
; T. J. Pearson
; A. C. S. Readhead
; D. Rusin
; E. Xanthopoulos
; | | Date: |
20 Sep 2000 | | Journal: | Mon.Not.Roy.Astron.Soc. 319 (2000) L7 | | Subject: | astro-ph | | Affiliation: | 1,2), I. W. A. Browne , N. J. Jackson , P. N. Wilkinson , A. D. Biggs , R. D. Blandford , A. G. de Bruyn (4,2), C. D. Fassnacht , P. Helbig (2,1), S. Mao , D. R. Marlow , S. T. Myers , T. J. Pearson , A. C. S. Readhead , D. Rusin , E. Xanthopoulos ( | | Abstract: | High resolution MERLIN observations of a newly-discovered four-image gravitational lens system, B0128+437, are presented. The system was found after a careful re-analysis of the entire CLASS dataset. The MERLIN observations resolve four components in a characteristic quadruple-image configuration; the maximum image separation is 542 mas and the total flux density is 48 mJy at 5 GHz. A best-fit lens model with a singular isothermal ellipsoid results in large errors in the image positions. A significantly improved fit is obtained after the addition of a shear component, suggesting that the lensing system is more complex and may consist of multiple deflectors. The integrated radio spectrum of the background source indicates that it is a GigaHertz-Peaked Spectrum (GPS) source. It may therefore be possible to resolve structure within the radio images with deep VLBI observations and thus better constrain the lensing mass distribution. | | Source: | arXiv, astro-ph/0009334 | | Services: | Forum | Review | PDF | Favorites | |
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