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CLASS B0445+123: a new two-image gravitational lens system

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Open access via publisher
Authors
Argo, Megan
Jackson, N.
Browne, I.
York, T.
McKean, J.
Biggs, A.
Blandford, R.
deBruyn, A.
Chae, K.
Fassnacht, C.
Koopmans, L.
Myers, S.
Norbury, M.
Pearson, T.
Phillips, P.
Readhead, A.
Rusin, D.
Wilkinson, P.
Date
2003
Type
Journal Article

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Citation
Argo, M. K. and Jackson, N.J. and Browne, I.W.A. and York, T. and McKean, J.P. and Biggs, A.D. and Blandford, R.D. and deBruyn, A.G. and Chae, K.H. and Fassnacht, C.D. and Koopmans, L.V.E. and Myers, S.T. and Norbury, M. and Pearson, T.J. and Phillips, P.M. and Readhead, A.C.S. and Rusin, D. and Wilkinson, P.N. 2003. CLASS B0445+123: a new two-image gravitational lens system. Monthly Notices of the Royal Astronomical Society. 338 (4): pp. 957-961.
Source Title
Monthly Notices of the Royal Astronomical Society
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Faculty
Faculty of Science and Engineering
Curtin Institute of Radio Astronomy
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Abstract

A new two-image gravitational lens system has been discovered as a result of the Cosmic Lens All-Sky Survey. Radio observations with the Very Large Array (VLA), the Multi Element Radio Linked Interferometer Network and the Very Long Baseline Array at increasingly higher resolutions all show two components with a flux density ratio of ~7 : 1 and a separation of 1.34 arcsec. Both components are compact and have the same spectral index. Follow-up observations made with the VLA at 8.4 GHz show evidence of a feature to the south-east of the brighter component and a corresponding extension of the weaker component to the northwest. Optical observations with the William Herschel Telescope show ~1.7-arcsec extended emission aligned in approximately the same direction as the separation between the radio components with an R-band magnitude of 21.8 ± 0.4.