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Submillimetre detection of a high-redshift type 2 QSO |
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| Authors: | V Mainieri D Rigopoulou I Lehmann S Scott I Matute O Almaini P Tozzi G Hasinger J S Dunlop |
| Institution: | Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße, PF 1312, 85741 Garching, Germany;Astrophysics, Department of Physics, Keble Road, Oxford OX1 3RH;Institut for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ;School of Physics &Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD;INAF, Osservatorio Astronomico di Trieste, via G.B. Tiepolo 11, I-34131, Trieste, Italy |
| Abstract: | We report on the first SCUBA detection of a type 2 QSO at z = 3.660 in the Chandra Deep Field South. This source is X-ray-absorbed, shows only narrow emission lines in the optical spectrum and is detected in the submillimetre: it is the ideal candidate in an evolution scheme for active galactic nuclei (AGN) (e.g. Fabian 1999 ; Page et al. 2004 ) of an early phase corresponding to the main growth of the host galaxy and formation of the central black hole. The overall photometry (from the radio to the X-ray energy band) of this source is well reproduced by the spectral energy distribution (SED) of NGC 6240, while it is incompatible with the spectrum of a type 1 QSO (3C 273) or a starburst galaxy (Arp 220). Its submillimetre (850 μm) to X-ray (2 keV) spectral slope (α |
| Keywords: | galaxies: active galaxies: nuclei quasars: general submillimetre |