The evolution of AGNs in the Hard X-Rays and the Infrared

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dc.creatorLa Franca, F.
dc.creatorMatute, I.
dc.creatorFiore, F.
dc.creatorGruppioni, C.
dc.creatorPozzi, F.
dc.creatorHELLAS, C. Vignali plus
dc.creatorcollaborations, ELAIS
dc.date2001-09-19
dc.date2001-11-07
dc.date.accessioned2026-07-07T02:00:04Z
dc.date.available2026-07-07T02:00:04Z
dc.descriptionWe 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 (Omega_m,Omega_lambda)=(1.0,0.0) and in a (Omega_m,Omega_lambda)=(0.3,0.7) cosmology respectively. In a (Omega_m,Omega_lambda)=(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 (Omega_m,Omega_lambda)=(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.
dc.descriptionInvited 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
dc.identifierhttps://arxiv.org/abs/astro-ph/0109308
dc.identifierhttp://arxiv.org/abs/astro-ph/0109308
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/3347
dc.subjectAstrophysics
dc.titleThe evolution of AGNs in the Hard X-Rays and the Infrared
dc.typetext

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