Highly-magnified multiply imaged Radio counterpart of the Sub-mm Starburst Emission in the Cluster-Lens MS0451.6-0305
DOI: 10.1051/0004-6361:20065223 (http) or 10.1051/0004-6361:20065223 (doi)
ADS bibcode 2007A&A...462..903B
astro-ph/0603466
A. Berciano Alba [1,2], M.A. Garrett [1], L.V.E. Koopmans [2], O. Wucknitz [1]
- JIVE, Dwingeloo, The Netherlands
- Kapteyn Institute, Groningen, The Netherlands
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
(ca. 1 arcmin), 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
ca. 1 arcmin 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(850mu)/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 overall structure can
be explained, using a simple lens model, with three multiply-imaged radio
sources at ca. z=2.9. 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
A&A 462 (2007) 903 (link to online journal)
DOI (Digital Object Identifier): 10.1051/0004-6361:20065223 (http) or 10.1051/0004-6361:20065223 (doi)
ADS bibcode 2007A&A...462..903B (link to ADS entry)
Preprint version with reduced resolution images (13 pages):
astro-ph/0603466 (link to e-print archive)
download full article (A&A version)
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