Far-infrared/millimetre emission in 3C sources

Free access article

Issue		A&A Volume 381, Number 2, January II 2002


Page(s)		389 - 400
Section		Extragalactic astronomy
DOI		http://dx.doi.org/10.1051/0004-6361:20011509

A&A 381, 389-400 (2002)
DOI: 10.1051/0004-6361:20011509

Dust in radio galaxies and quasars

P. Andreani¹, R. A. E. Fosbury², I. van Bemmel³ and W. Freudling²

¹ Osservatorio Astronomico Padova, Vicolo dell'Osservatorio 5, Padova, 35122, Italy (Present address: Max-Planck-I. für Extraterrestrische Physik, Postfach 1312, 85741 Garching, Germany)
    e-mail: andreani@mpe.mpg.de
² Space Telescope - European Coordinating Facility European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching bei München, Germany
    e-mail: rfosbury@eso.org,wfreudli@eso.org
³ Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, The Netherlands
    e-mail: bemmel@astro.rug.nl

(Received 12 April 2001 / Accepted 18 October 2001 )

Abstract
We present far-infrared and millimetric observations of a sample of 3C objects. Millimetre data were taken at 1.25 mm with the IRAM 30 m antenna feeding the MPIfR bolometer array. Mid-infrared (MIR) and far-infrared (FIR) photometry were carried out with the ISOCAM and ISOPHOT cameras on the ISO Satellite. Additional FIR IRAS observations are also included. We present the entire Spectral Energy Distributions (SEDs) from the UV to radio and discuss the emitting mechanisms. Two composite spectra, one for the radio galaxies and one for the radio quasars, are built in the object rest frame. While the SEDs of the two classes differ, they are indistinguishable in the MIR and FIR range where they probably arise as thermal emission from a dusty torus and a larger-scale (cooler) dust distribution in the host galaxy.

Key words: galaxies: photometry, ISM -- quasars: general -- ISM: dust -- radio continuum: galaxies, ISM

Offprint request: P. Andreani, andreani@npe.npg.de

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