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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 710173.0, MPI für Astronomie / Publikationen_mpia
Spectral energy distributions of QSOs at z > 5: Common active galactic nucleus-heated dust and occasionally strong star-formation
Authors:Leipski, C.; Meisenheimer, K.; Walter, F.; Klaas, U.; Dannerbauer, H.; De Rosa, G.; Fan, X.; Haas, M.; Krause, O.; Rix, H. -. W.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:The Astrophysical Journal
Issue / Number:2
Start Page:id. 154 (22 pp)
Audience:Not Specified
Abstract / Description:We present spectral energy distributions (SEDs) of 69 QSOs at z > 5, covering a rest frame wavelength range of 0.1 mum to ~80 mum, and centered on new Spitzer and Herschel observations. The detection rate of the QSOs with Spitzer is very high (97% at lambdarest <~ 4 mum), but drops toward the Herschel bands with 30% detected in PACS (rest frame mid-infrared) and 15% additionally in the SPIRE (rest frame far-infrared; FIR). We perform multi-component SED fits for Herschel-detected objects and confirm that to match the observed SEDs, a clumpy torus model needs to be complemented by a hot (~1300 K) component and, in cases with prominent FIR emission, also by a cold (~50 K) component. In the FIR-detected cases the luminosity of the cold component is of the order of 1013 L &sun; which is likely heated by star formation. From the SED fits we also determine that the active galactic nucleus (AGN) dust-to-accretion disk luminosity ratio declines with UV/optical luminosity. Emission from hot (~1300 K) dust is common in our sample, showing that nuclear dust is ubiquitous in luminous QSOs out to redshift 6. However, about 15% of the objects appear under-luminous in the near infrared compared to their optical emission and seem to be deficient in (but not devoid of) hot dust. Within our full sample, the QSOs detected with Herschel are found at the high luminosity end in L UV/opt and L NIR and show low equivalent widths (EWs) in Halpha and in Lyalpha. In the distribution of Halpha EWs, as determined from the Spitzer photometry, the high-redshift QSOs show little difference to low-redshift AGN.
Free Keywords:galaxies: active; infrared: galaxies; quasars: general
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X %R 10.1088/0004-637X/785/2/154
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