Open AccessISO observations of the dusty quasar BR 1202−0725
Author(s) -
Leech K.J.,
Metcalfe L.,
Altieri B.
Publication year - 2001
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2001.04941.x
Subject(s) - physics , quasar , astrophysics , astronomy , galaxy
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.