2001/09/19 by F. La Franca, I. Matute, La Franca, F. +13
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Gamma-ray bursts and supernovae #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0109308
Invited talk. 12 pages and 11 ps figures. Presented at the meeting: "Issues in unifications of AGNs", Marciana Marina, May 2001; eds. R. Maiolino, A. Marconi and N. Nagar. This version is a replacement of an earlier version and includes correction of typos and a re-calculation of the LF at 15mu
We present the estimate of the evolution of type 1 AGNs in the hard (2-10 keV) X-rays drawn from the HELLAS survey, and in the IR (15um) obtained from the ELAIS survey. We find that the local luminosity function (LF) of AGN1 in the 2-10 keV band is fairly well represented by a double-power-law-function. There is evidence for significant cosmological evolution according to a pure luminosity evolution model Lx(z)~(1+z)k, with k=2.12 and k=2.19 in a (Omegam,Omegalambda)=(1.0,0.0) and in a (Omegam,Omegalambda)=(0.3,0.7) cosmology respectively. In a (Omegam,Omegalambda)=(1.0,0.0) Universe the data show an excess of faint high redshift type 1 AGN which is well modeled by a luminosity dependent density evolution, similarly to what observed in the soft X-rays. In the IR band, with a (Omegam,Omegalambda)=(1.0,0.0) cosmology, the evolution found is similar to what observed in other wavebands, the LF is a double-power-law-function with a bright slope 2.9 and a faint slope 1.1, following a luminosity evolution model L(z)~(1+z)3.0.