Active galactic nuclei in the mid-IR Evolution and contribution to the cosmic infrared background

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作者：
Matute, I. [1 ,2 ]
La Franca, F. [2 ]
Pozzi, F. [3 ,4 ]
Gruppioni, C. [4 ]
Lari, C. [5 ]
Zamorani, G. [4 ]
机构：
[1] Max-Planck Institut für Extraterrestrische Physik (MPE), Giessenbachstraße, 85741 Garching, Germany
[2] Dipartimento di Fisica, Università degli Studi Roma Tre, via della Vasca Navale 84, 00146 Roma, Italy
[3] Dipartimento di Astronomia, Università di Bologna, via Ranzani 1, 40127 Bologna, Italy
[4] INAF, Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy
[5] INAF, Istituto di Radioastronomia (IRA), via Gobetti 101, 40129 Bologna, Italy
来源：
Astronomy and Astrophysics | 1600年 / 451卷 / 02期
关键词：
Aims. We study the evolution of the luminosity function (LF) of type-1 and type-2 Active Galactic Nuclei (AGN) in the mid-infrared; derive the contribution of the AGN to the Cosmic InfraRed Background (CIRB) and the expected source counts to be observed by Spitzer at 24μm. Methods. We used a sample of type-1 and type-2 AGN selected at 15μm (ISO) and 12μm (IRAS); and classified on the basis of their optical spectra. Local spectral templates of type-1 and type-2 AGN have been used to derive the intrinsic 15μm luminosities. We adopted an evolving smooth two-power law shape of the LF; whose parameters have been derived using an un-binned maximum likelihood method. Results. We find that the LF of type-1 AGN is compatible with a pure luminosity evolution (L(z) = L(0)(1 + z)kL) model where kL ∼ 2.9. A small flattening of the faint (L15 15*) slope of the LF with increasing redshift is favoured by the data. A similar evolutionary scenario is found for the type-2 population with a rate kL ranging from ∼1.8 to 2.6; depending significantly on the adopted mid-infrared spectral energy distribution. For type-2 AGN a flattening of the LF with increasing redshift is suggested by the data; possibly caused by the loss of a fraction of type-2 AGN hidden within the optically classified starburst and normal galaxies. The type-1 AGN contribution to the CIRB at 15μm is (4.2-12.1) × 10-11 W m-2 sr-1; while the type-2 AGN contribution is (5.5-11.0) × 10-11 W m-2 sr-1. We expect that Spitzer will observe; down to a flux limit of S24μm = 0.01 mJy. a density of ∼ 1200 deg-2 type-1 and ∼1000 deg-2 type-2 optically classified AGN. Conclusions. AGN evolve in the mid-infrared with a rate similar to the ones found in the optical and X-rays bands. The derived total contribution of the AGN to the CIRB (4-10%) and Spitzer counts should be considered as lower limits; because of a possible loss of type-2 sources caused by the optical classification. © ESO 2006;
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页码：443 / 456
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