Article (Scientific journals)
Herschel-PACS far-infrared photometry of two z > 4 quasars
Leipski, C.; Meisenheimer, K.; Klaas, U. et al.
2010In Astronomy and Astrophysics, 518 (Letters), p. 34, pp. 1-4
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Keywords :
galaxies: active; infrared: galaxies; quasars: individual: SDSS J1148+5251; quasars: individual: BR 1202-0725
Abstract :
[en] 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 λ[SUB]rest[/SUB] ≲ 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Leipski, C.;  Max-Planck Institut für Astronomie (MPIA), Königstuhl 17, 69117 Heidelberg, Germany
Meisenheimer, K.;  Max-Planck Institut für Astronomie (MPIA), Königstuhl 17, 69117 Heidelberg, Germany
Klaas, U.;  Max-Planck Institut für Astronomie (MPIA), Königstuhl 17, 69117 Heidelberg, Germany
Walter, F.;  Max-Planck Institut für Astronomie (MPIA), Königstuhl 17, 69117 Heidelberg, Germany
Nielbock, M.;  Max-Planck Institut für Astronomie (MPIA), Königstuhl 17, 69117 Heidelberg, Germany
Krause, O.;  Max-Planck Institut für Astronomie (MPIA), Königstuhl 17, 69117 Heidelberg, Germany
Dannerbauer, H.;  Service d'Astrophysique (SAp)/IRFU/DSM/CEA Saclay - Bât. 709, 91191 Gif-sur-Yvette Cedex, France
Bertoldi, F.;  Argelander Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
Besel, M*-A;  Max-Planck Institut für Astronomie (MPIA), Königstuhl 17, 69117 Heidelberg, Germany
de Rosa, G.;  Max-Planck Institut für Astronomie (MPIA), Königstuhl 17, 69117 Heidelberg, Germany
Fan, X.;  Steward Observatory, University of Arizona, Tucson, AZ 85721, USA
Haas, M.;  Astronomisches Institut Ruhr-Universität Bochum, Universitätsstraße 150, 44801 Bochum, Germany
Hutsemekers, Damien ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Jean, C.;  Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200B, 3001 Heverlee, Belgium
Lemke, D.;  Max-Planck Institut für Astronomie (MPIA), Königstuhl 17, 69117 Heidelberg, Germany
Rix, H*-W;  Max-Planck Institut für Astronomie (MPIA), Königstuhl 17, 69117 Heidelberg, Germany
Stickel, M.;  Max-Planck Institut für Astronomie (MPIA), Königstuhl 17, 69117 Heidelberg, Germany
More authors (7 more) Less
Language :
English
Title :
Herschel-PACS far-infrared photometry of two z > 4 quasars
Publication date :
01 July 2010
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
518
Issue :
Letters
Pages :
34, pp. 1-4
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
http://de.arxiv.org/abs/1005.5016
Available on ORBi :
since 04 January 2011

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