P. Héraudeau 1, C. Surace 1, D. Lemke 1, & M. Rowan-Robinson 2
1 Max-Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
2 Astrophysics group, Imperial College, Prince Consort Rd, London SW72BZ, England
ELAIS (PI M. Rowan-Robinson) is a 15 deg2 survey with ISO at 15 (with ISOCAM) and 90 microns (with ISOPHOT). The project groups 19 European institutions and is supported by one of the EC TMR Networks awarded in Astronomy. The different goals addressed in this survey lie from the epoch of galaxy formation to Ultra IR galaxies and new classes of Galactic and Extra galactic objects. We reduced the data using Phot Interactive Analysis coupled with detection-dedicated routines. We then classified the sources in 3 groups depending on their reliability and flux level. We undertook the NIR follow-up of the ELAIS ISOPHOT detections using the ESO-MPIA 2.2m telescope (La Silla, Chile). We observed 100 sources in the K' band and derived identifications (stars, galaxies, mergers), accurate coordinates and integrated magnitudes of the objects. We present the characteristics of the ISOPHOT sources and discuss the correlation Optical-NIR-FIR of the sources as well as the distribution of the objects in the different classes.