Herve Aussel
IPAC

       ISOCAM ultradeep surveys,
   Early results and perspectives.


With its unprecedented sensitivity, ISOCAM, the mid IR imager of the
ISO satellite has opened a new window for the study of dust and star
formation in moderately distant galaxies. Many surveys have been
undertaken, in guaranteed as well as in open time, with various
surface coverage and sensitivity. However, the reduction of the ISOCAM
data is not straightforward, due to the sensitivity of the detector to
cosmic rays and its memory effects. Several teams have designed
specific tools to handle these effects. I will present the basics of
the Pattern REcognition Technique for ISOCAM data (PRETI) that has
been developped by us at the Service d'Astrophysique (Saclay). I will
present the results obtained with this technique on the ISOCAM
observation of the Hubble Deep Field at 15 and 7 microns. We detect 49
number counts derived from this observation, and compare them to other
mid-IR surveys.