Unveiling the evolution of type I AGNs in the IR (15 mu m) - As seen by ISO in the ELAIS-S1 region

We present the first estimate of the evolution of type 1 AGNs in the IR (15 mum) obtained from the ELAIS survey in the S1 region. We find that the luminosity function (LF) of Type 1 AGNs at 15mum is fairly well represented by a double power-law function with a bright slope of 2.9 and a faint slope of 1.1. There is evidence for significant cosmological evolution according to a pure luminosity evolution model L-15(z)proportional to(1+z)(k), with k=3.00(-0.20)(+0.16) in a (Omega(m),Omega(Lambda))=(1.0,0.0) cosmology. This evolution is similar to what is observed at other wavebands. From the luminosity function and its evolution, we estimate a contribution of similar to 2% from Type 1. AGN to the total Cosmic Infrared Background (CIRB) at 15 mum.