Infrared Properties of AGN in the GOODS Fields: AGN in Stellar Dominated High-z Galaxies

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dc.creatorVan Duyne, Jeffrey
dc.creatorUrry, C. Meg
dc.creatorChatzichristou, Eleni
dc.creatorTreister, Ezequiel
dc.creatorTeam, the GOODS AGN
dc.date2005-03-02
dc.date.accessioned2026-07-07T02:17:08Z
dc.date.available2026-07-07T02:17:08Z
dc.descriptionWe present analysis of spectral energy distributions (SEDs) from mid-infrared through X-ray of a sample of 420 hard X-ray selected, z-band and Spitzer/IRAC detected active galactic nuclei (AGN) and AGN candidates from the GOODS multiwavelength survey. We fit local empirical SED templates of both normal and active galaxies to the rest-frame luminosities calculated from spectroscopic (where available) and photometric redshifts. The majority of the optically stellar-dominated (with early-type galaxy fits) sources are moderately luminous (L_X,2-10 keV ~ 10^43 erg/s) hard X-ray sources with high X-ray hardness ratios (HR > 0.2), high MIR luminosities and red MIR colors in excess of a typical stellar dominated elliptical galaxy. These sources likely harbor heavily obscured (though Compton-thin) AGN. The observed ratio of obscured to unobscured AGN has an integrated mean of ~3.4:1 but declines with increasing redshift. This effect has been explained by Treister et al. (2004) as an observational bias triggered by the lack of spectroscopic redshifts at R > 24 which are predominantly higher redshift obscured sources.
dc.description2 pages, 1 figure; Will appear in the "Spitzer: New Views on the Cosmos" November 2004 conference proceedings to be published by the Astronomical Society of the Pacific
dc.identifierhttps://arxiv.org/abs/astro-ph/0503056
dc.identifierhttp://arxiv.org/abs/astro-ph/0503056
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/9058
dc.subjectAstrophysics
dc.titleInfrared Properties of AGN in the GOODS Fields: AGN in Stellar Dominated High-z Galaxies
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