Highly-magnified, Multiply-imaged radio counterparts of the Sub-mm Starburst Emission in th.pdfVIP

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Highly-magnified, Multiply-imaged radio counterparts of the Sub-mm Starburst Emission in th.pdf

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Highly-magnified, Multiply-imaged radio counterparts of the Sub-mm Starburst Emission in th

a r X i v : a s t r o - p h / 0 6 0 3 4 6 6 v 2 2 0 N o v 2 0 0 6 Astronomy Astrophysics manuscript no. 5223p ? ESO 2008 February 5, 2008 Highly-magnified, Multiply-imaged radio counterparts of the Sub-mm Starburst Emission in the Cluster-Lens MS0451.6?0305 A. Berciano Alba 1,2 , M.A. Garrett 1 , L.V.E. Koopmans 2 O. Wucknitz 1 1 Joint Institute for VLBI in Europe, Postbus 2, 7990 AA, Dwingeloo, The Netherlands 2 Kapteyn Astronomical Institute, University of Groningen, P.O.box 800, 9700 AV, Groningen, The Netherlands Received ...; accepted ... ABSTRACT Context. Previous authors have reported the detection of intrinsically faint sub-mm emission lensed by the cluster MS0451.6?0305. They suggest that this emission arises from a merging system composed of a Ly-break galaxy and a pair of extremely red objects which are multiply-imaged in the optical/NIR observations. Aims. Since the submm emission presents an unusually large angular extent (～1′), the possible radio emission asociatted with that system can help to identify optical/NIR counterparts due to the higher spatial resolution and astrometric accuracy of the radio observations. Methods. Archive VLA data (BnA configuration at 1.4 GHz) was reduced and analysed. A simple lens model was constructed to aid the interpretation of the radio and pre-existing sub-mm and optical/NIR data. Results. We present a 1.4 GHz map of the central region of MS0451.6?0305 and report the detection of gravitationally lensed radio emission, coincident with the previously discovered sub-mm lensed emission. The overall morphology and scale of the radio and sub-mm emission are strikingly similar, extending ～ 1′ across the sky. This observation strongly suggests that the radio and sub-mm emission arise from the same sources. Preliminary estimates of the total S 850μm/S 1.4GHz flux density ratio appear to be consistent with that expected from distant star forming galaxies. The radio emission is resolved into 7 distinct components, and the