| Issue |
A&A
Volume 462, Number 3, February II 2007
|
|
|---|---|---|
| Page(s) | 903 - 911 | |
| Section | Extragalactic astronomy | |
| DOI | https://doi.org/10.1051/0004-6361:20065223 | |
| Published online | 13 November 2006 | |
Highly-magnified, multiply-imaged radio counterparts of the sub-mm starburst emission in the cluster-lens MS0451.6-0305*
1
Joint Institute for VLBI in Europe, Postbus 2, 7990 AA, Dwingeloo, The Netherlands e-mail: berciano@astro.rug.nl
2
Kapteyn Astronomical Institute, University of Groningen, PO Box 800, 9700 AV, Groningen, The Netherlands
Received:
17
March
2006
Accepted:
5
October
2006
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 ~
across the
sky. This observation strongly suggests that the radio and sub-mm
emission arise from the same sources. Preliminary estimates of
the total 
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 overall structure can be explained,
using a simple lens model, with three multiply-imaged radio
sources at 
. One of these sources is predicted to lie
in the middle of the previously mentioned merging system in the source
plane, suggesting that it is related to the intense star
formation generated during the merging process.
Key words: gravitational lensing / galaxies: starburst / radio continuum: galaxies / galaxies: clusters: individual: MS0451.6-0305
© ESO, 2007
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