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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The AGN content in luminous infrared galaxies at z∼ 2 from a global SED analysis including Herschel data
Monthly Notices of the Royal Astronomical Society, Volume 423, No. 2, Year 2012
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Description
We use Herschel-PACS far-infrared (IR) data, combined with previous multiband information and mid-IR spectra, to properly account for the presence of an active nucleus and constrain its energetic contribution in luminous IR sources at z∼ 2. The sample is composed of 24 sources in the GOODS-South field, with typical IR luminosity of 1012L⊙. Data from the 4 Ms Chandra X-ray imaging in this field are also used to identify and characterize active galactic nucleus (AGN) emission. We reproduce the observed spectral energy distribution (SED), decomposed into a host-galaxy and an AGN component. A smooth-torus model for circumnuclear dust is used to account for the direct and reprocessed contribution from the AGN. We confirm that galaxies with typical at z∼ 2 are powered predominantly by star formation. An AGN component is present in nine objects (∼35per cent of the sample) at the 3σ confidence level, but its contribution to the 8-1000m emission accounts for only ∼5per cent of the energy budget. The AGN contribution rises to ∼23per cent over the 5-30m range (in agreement with Spitzer IRS results) and to ∼60per cent over the narrow 2-6m range. The presence of an AGN is confirmed by X-ray data for three (out of nine) sources, with X-ray spectral analysis indicating the presence of significant absorption, i.e. NH∼ 1023-1024cm-2. An additional source shows indications of obscured AGN emission from X-ray data. The comparison between the mid-IR-derived X-ray luminosities and those obtained from X-ray data suggests that obscuration is likely present also in the remaining six sources that harbour an AGN according to the SED-fitting analysis. © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS.
Authors & Co-Authors
Pozzi, Francesca
Italy, Bologna
Alma Mater Studiorum Università Di Bologna
Italy, Bologna
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Bologna
Vignali, Cristian
Italy, Bologna
Alma Mater Studiorum Università Di Bologna
Italy, Bologna
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Bologna
Gruppioni, Carlotta
Italy, Bologna
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Bologna
Feltre, Anna
Unknown Affiliation
Fritz, Jacopo
Belgium, Ghent
Universiteit Gent
Andreani, Paola M.
Germany, Garching Bei Munchen
European Southern Observatory
Berta, Stefano
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Cimatti, Andrea
Italy, Bologna
Alma Mater Studiorum Università Di Bologna
Delvecchio, Ivan
Italy, Bologna
Alma Mater Studiorum Università Di Bologna
Italy, Bologna
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Bologna
Lutz, Dieter
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Magnelli, Benjamin
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Maiolino, Roberto
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Nordon, Raanan
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Popesso, Paola
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Rodighiero, Giulia
Unknown Affiliation
Rosario, David J.V.
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Santini, Paola
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Vaccari, Mattia
Unknown Affiliation
Statistics
Citations: 30
Authors: 18
Affiliations: 7
Identifiers
Doi:
10.1111/j.1365-2966.2012.21015.x
ISSN:
00358711
Research Areas
Environmental