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

被引：0
|
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;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Journal article (JA)
引用
收藏
页码：443 / 456
相关论文
共 50 条
  • [21] COSMIC X-RAY-BACKGROUND FROM EARLY ACTIVE GALACTIC NUCLEI
    ZDZIARSKI, AA
    IAU SYMPOSIA, 1989, (134): : 207 - 208
  • [22] ARE ACTIVE GALACTIC NUCLEI THE SOLUTION TO THE EXCESS COSMIC RADIO BACKGROUND AT 1.4 GHz?
    Draper, A. R.
    Northcott, S.
    Ballantyne, D. R.
    ASTROPHYSICAL JOURNAL LETTERS, 2011, 741 (02)
  • [23] The nature of the sources of the mid-IR background light
    Sánchez-Fernández, C
    MULTIWAVELENGTH AGN SURVEYS, 2004, : 85 - 88
  • [24] COMPTON REFLECTION IN ACTIVE GALACTIC NUCLEI AND THE COSMIC X-RAY-BACKGROUND
    ROGERS, RD
    FIELD, GB
    ASTROPHYSICAL JOURNAL, 1991, 370 (02): : L57 - L60
  • [25] COSMIC X-RAY-BACKGROUND FROM EARLY ACTIVE GALACTIC NUCLEI
    ZDZIARSKI, AA
    ACTIVE GALACTIC NUCLEI /, 1989, 134 : 207 - 208
  • [26] THE EFFECT OF ACTIVE GALACTIC NUCLEI ON THE MID-INFRARED AROMATIC FEATURES
    Diamond-Stanic, Aleksandar M.
    Rieke, George H.
    ASTROPHYSICAL JOURNAL, 2010, 724 (01): : 140 - 153
  • [27] The origin of the mid-infrared nuclear polarization of active galactic nuclei
    Lopez-Rodriguez, E.
    Alonso-Herrero, A.
    Diaz-Santos, T.
    Gonzalez-Martin, O.
    Ichikawa, K.
    Levenson, N. A.
    Martinez-Paredes, M.
    Nikutta, R.
    Packham, C.
    Perlman, E.
    Ramos Almeida, C.
    Rodriguez-Espinosa, M.
    Telesco, C. M.
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2018, 478 (02) : 2350 - 2358
  • [28] COSMIC EVOLUTION OF RADIO SELECTED ACTIVE GALACTIC NUCLEI IN THE COSMOS FIELD
    Smolcic, V.
    Zamorani, G.
    Schinnerer, E.
    Bardelli, S.
    Bondi, M.
    Birzan, L.
    Carilli, C. L.
    Ciliegi, P.
    Elvis, M.
    Impey, C. D.
    Koekemoer, A. M.
    Merloni, A.
    Paglione, T.
    Salvato, M.
    Scodeggio, M.
    Scoville, N.
    Trump, J. R.
    ASTROPHYSICAL JOURNAL, 2009, 696 (01): : 24 - 39
  • [29] The evolution of active galactic nuclei across cosmic time: what is downsizing?
    Fanidakis, N.
    Baugh, C. M.
    Benson, A. J.
    Bower, R. G.
    Cole, S.
    Done, C.
    Frenk, C. S.
    Hickox, R. C.
    Lacey, C.
    Lagos, C. del P.
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2012, 419 (04) : 2797 - 2820
  • [30] Cosmic evolution of mass accretion rate and metallicity in active galactic nuclei
    Netzer, Hagai
    Trakhtenbrot, Benny
    ASTROPHYSICAL JOURNAL, 2007, 654 (02): : 754 - 763
12345