ISO observations of the dusty quasar BR 1202−0725 |
| |
Authors: | KJ Leech L Metcalfe B Altieri |
| |
Institution: | 1ISO Data Centre, Astrophysics Division, Space Science Department of ESA, Villafranca del Castillo, PO Box 50727, 28080 Madrid, Spain;2XMM-Newton Data Centre, Astrophysics Division, Space Science Department of ESA, Villafranca del Castillo, PO Box 50727, 28080 Madrid, Spain |
| |
Abstract: | We present mid- and far-infrared photometry of the high-redshift dusty quasar BR 1202−0725. The quasar was detected in the near-infrared, at a flux level consistent with an average radio-quiet quasar at its redshift. Only upper limits for the emission were obtained in the far-infrared. These upper limits, when combined with data from ground-based telescopes, are the first direct evidence for a turnover in the far-infrared emission, and hence confirm that a blackbody dominates the spectral energy distribution at far-infrared wavelengths. This blackbody is most probably cool dust, constrained to have a temperature below 80 K, for a β of 1.5. |
| |
Keywords: | galaxies: active galaxies: photometry quasars: individual: BR 1202−0725 infrared: galaxies |
|
|