Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12194n&link_type=abstract
HST Proposal ID #12194. Cycle 18
Astronomy and Astrophysics
Astrophysics
Scientific paper
We propose HST/WFC3 near-IR high-resolution imaging of five gravitational lens candidates produced by the Herschel Astrophysical Terahertz Large Area Survey {H-ATLAS}. These sources are among the brightest sub-mm objects detected in H-ATLAS. Their spectral energy distribution, sub-mm colors and optical IDs are consistent with a gravitational lensing system where a nearby {z< 0.3} elliptical galaxy is acting as a lens on a dust-obscured high-redshift {z> 3} galaxy. However, the background galaxy is predicted to be too faint in the optical/near-IR to be detectable in the ancillary SDSS and UKIDSS images, therefore our proposal for deep near-IR imaging with HST/WFC3. The discovery of gravitational lenses is one of the scientific goals of H-ATLAS and, if achieved, it will demonstrate the efficiency of blank wide-area sub-mm survey in producing unbiased and complete samples of gravitational lensing systems. Thanks to its sensitivity and unique spatial resolution HST/WFC3 will allow us to constrain the morphology of the brightest sub-mm sources detected by Herschel and therefore to eventually confirm their nature as gravitational lenses. In that case we will use HST/WFC3 images to reconstruct the intrinsic morphology of the background source and constrain the mass and matter profile of the lens.;
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