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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 559313.0, MPI für Astronomie / Publikationen_mpia
Herschel-PACS far-infrared photometry of two z > 4 quasars
Authors:Leipski, C.; Meisenheimer, K.; Klaas, U.; Walter, F.; Nielbock, M.; Krause, O.; Dannerbauer, H.; Bertoldi, F.; Besel, M. A.; de Rosa, G.; Fan, X.; Haas, M.; Hutsemekers, D.; Jean, C.; Lemke, D.; Rix, H. W.; Stickel, M.
Date of Publication (YYYY-MM-DD):2010
Title of Journal:Astronomy and Astrophysics
Journal Abbrev.:Astronomy and Astrophysics
Start Page:id.L34
Review Status:not specified
Audience:Experts Only
Abstract / Description:We present Herschel far-infrared (FIR) observations of two sub-mm bright quasars at high redshift: SDSS J1148+5251 (z = 6.42) and BR 1202-0725 (z = 4.69) obtained with the PACS instrument. Both objects are detected in the PACS photometric bands. The Herschel measurements provide additional data points that constrain the FIR spectral energy distributions (SEDs) of both sources, and they emphasise a broad range of dust temperatures in these objects. For λrest ≲ 20 μm, the two SEDs are very similar to the average SEDs of quasars at low redshift. In the FIR, however, both quasars show excess emission compared to low-z QSO templates, most likely from cold dust powered by vigorous star formation in the QSO host galaxies. For SDSS J1148+5251 we detect another object at 160 μm with a distance of ~10´´ from the QSO. Although no physical connection between the quasar and this object can be shown with the available data, it could potentially confuse low-resolution measurements, thus resulting in an overestimate of the FIR luminosity of the z = 6.42 quasar. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.
Free Keywords:galaxies: active; infrared: galaxies; quasars: individual: SDSS J1148+5251; quasars: individual: BR 1202-0725
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2010A%26A...518L..34... [ID No:1]
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