Gravitational Lensing and Deep Infrared Surveys

Details Gravitational Lensing and Deep Infrared Surveys Gravitational Lensing and Deep Infrared Surveys

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..204..217m&link_type=abstract

The Extragalactic Infrared Background and its Cosmological Implications, Proceedings of IAU Symposium #204, held 15-18 August 20

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ISO'S infrared camera was used to make deep mid-infrared (MIR) images through 3 gravitationally lensing clusters of galaxies, A370, A2218 and A2390. Observations were made at 7 μm and 15 μm covering more than 50 square arcminutes, with the lensing increasing the sensitivity to background sources by a factor of 1.5 to 2. The large number of MIR sources detected behind the lenses provide source counts, corrected for cluster contamination and lensing distortion effects, which exceed by a factor of 10 the expectation from local counts assuming a no-evolution model. The results are consistent with larger-area surveys and the detected population resolves a substantial fraction of the background radiation intensity into discrete sources. We report the results of refined data analysis and indicate the direction taken by follow-up efforts to date, which include extensive K-band imaging and VLT spectroscopy of some peculiar objects.

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