Multiple Imaging of Intrinsically faint radio sources by the
massive cluster Abell 2218
- M.A. Garrett (JIVE), K. Knudsen (MPIA/Leiden) & P.P. van der Werf (Leiden)
We have detected discrete, lensed radio emission from the multiply
imaged, z=2.516 submillimetre selected galaxy, SMM J16359+6612. All
three images are detected in deep WSRT 1.4 GHz and VLA 8.2 GHz
observations, and the radio positions are coincident with previous
sub-mm SCUBA observations of this system (Kneib et al. 2004). These
observations break new ground:
this is the first time multiply lensed radio emission has been associated
with cluster lensing,
WSRT16359+6612~A,B,C is the widest separation lens system to be
detected in the radio so far,
first time that multiply imaged lensed radio emission has been
detected from a star forming galaxy (all other radio lens surveys
e.g. CLASS target bright AGN),
the sources detected are highly magnified and therefore
intrinsically very faint - S ~ few microJy
integrations times of ~ 1 year would be required to detect these
sources with the same level of significance (in the absence of the lens
magnification factor),
3 other SCUBA sources in the field are also detected by the WSRT,
including SMMJ16359+66118, a singly imaged (and magnified) arclet at
z=1.034.
further high resolution radio observations of SMMJ16359+6612 (and
other highly magnified star forming galaxies) will provide a unique
opportunity to study the general properties and radio morphology of
distant, obscured and intrinsically faint (but dominant), star
forming galaxies.
For more details about this read the paper -
(Garrett, Knudsen &
v.d. Werf, 2005).
Some associated "pretty pictures" include:
WSRT 1.4 GHz image of lensed images SMMJ16359+6612~A,B.C (and Arc #289)
in Abell 2218, superimposed upon an HST image of the field.
VLA 8.2 GHz image of lensed images SMMJ16359+6612~A,B.C (and Arc #289)
in Abell 2218, superimposed upon an HST image of the field.
VLA image of lensed images SMMJ16359+6612~A,B.C and Arc #289
in Abell 2218.
Wide-field WSRT 1.4 GHz countour map of the full A2218 field,
superimposed on an optical CFHT image.
Wide-field WSRT 1.4 GHz image of the target field centred on
Abell 2218.
Wide-field VLA 8.2 GHz image of the target field centred on
Abell 2218.
HST WFPC image of Abell 2218 (Fruchter et al. 2001)
Mike Garrett's Home Page
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VLA 8.2 GHz image of lensed images SMMJ16359+6612~A,B.C (and Arc #289)
in Abell 2218, superimposed upon an HST image of the field.