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Date and Time of the Query: 2019-04-23 T19:03:33 PDT
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For refcode 1999A&A...343L..65A:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1999A&A...343L..65A An ultra-deep ISOCAM observation through a cluster-lens. ALTIERI B., METCALFE L., KNEIB J.P., MCBREEN B., AUSSEL H., BIVIANO A., DELANEY M., ELBAZ D., LEECH K., LEMONON L., OKUMURA K., PELLO R., SCHULZ B. Received 30 October 1998/Accepted 3 February 1999 Abstract: We present results of ultra-deep ISOCAM observations through a cluster-lens at 75m and 155m with the Infrared Space Observatory (ISO) satellite. These observations reveal a large number of luminous Mid- Infrared (MIR) sources. Cross-identification in the optical and Near- Infrared (NIR) wavebands shows that about half of the 75m sources are cluster galaxies. The other 75m and almost all 155m sources are identified as lensed distant galaxies. Thanks to the gravitational amplification they constitute the faintest sources detected in the MIR, allowing us to extend the number counts in both the 7 and 155m bands. In particular, we find that the 15micron counts have a steep slope {alpha}_15micron_=-1.5+/-0.3 and are large, with N_15micron(>30microJy)=13+/-5arcmin^-2^. These numbers rule out non-evolutionary models and favour very strong evolution. Down to our counts limit, we found that the resolved 7micron and 15micron background radiation intensities are respectively (1.7+/-0.5)x10^-9^ and (3.3+/- 1.3)x10^-9^Wm^-2^ sr^-1^. Keywords: galaxies: abundances - galaxies: clusters: general - galaxies: evolution - cosmology: gravitational lensing - infrared: galaxies
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