Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-05-27
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
4 pages, 3 figures, accepted for publication in the A&A special issue on Herschel
Scientific paper
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 lambda_rest ~< 20mu, 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 160mu with a distance of ~10 arcseconds 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.
Bertoldi Frank
Besel Marc-André
Dannerbauer Helmut
Fan Xiaohui
Haas Marcel
No associations
LandOfFree
Herschel/PACS far-infrared photometry of two z>4 quasars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Herschel/PACS far-infrared photometry of two z>4 quasars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Herschel/PACS far-infrared photometry of two z>4 quasars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-192134