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Published online by Cambridge University Press: 25 September 2002
We present initial results of a deep mid-infrared surveyconducted in the high galactic latitude field SSA13 with ISO.We have surveyed through the broad band filterLW2 (5-8.5 μm)of the mid-infrared camera ISOCAMto probe the near-infrared light at high redshift.The 80% completeness limit for point sources in the central6 arcmin2 reaches 10 μJy at 6.7 μm.65 sources are detected down to 6 μJy in 16 arcmin2.The integral galaxy number countsare 1.4 × 104 deg-2at 10 μJy with the slope of -1.5.The integrated 6.7 μm light down to 6 μJyis estimated as 0.43 nWm-2sr-1.Our counts are consistent withthe results in the HDF andthe model predictionbased on the K band local luminosity function.It suggests thatthe majority of the detected sources areE/S0 galaxies at z>1.