EDP Sciences
Free access
Volume 368, Number 2, March III 2001
Page(s) 414 - 419
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20010040

A&A 368, 414-419 (2001)
DOI: 10.1051/0004-6361:20010040

Millimeter observations of radio-loud active galaxies

I. M. van Bemmel1, 2 and F. Bertoldi3

1  European Southern Observatory, Karl-Schwarzschildstr. 2, 85748 Garching bei München, Germany
2  Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, The Netherlands
3  Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany

(Received 9 August 2000 / 12 December 2000)

In order to study the nature of the far-infrared emission observed in radio-loud active galaxies, we have obtained 1.2 mm observations with the IRAM 30 m telescope for a sample of eight radio-loud active galaxies. In all objects we find that the 1.2 mm emission is dominated by non-thermal emission. An extrapolation of the non-thermal radio spectrum indicates that the contribution of synchrotron emission to the far-infrared is less than 10% in quasars, and negligible in the radio galaxies. The quasars in the sample show signs of relativistic beaming at millimeter wavelengths, and the quasar 3C 334 shows evidence for strong variability.

Key words: galaxies: active -- galaxies: photometry -- quasars: general -- infrared: general -- infrared: galaxies -- radio continuum: galaxies

Offprint request: I. M. van Bemmel, bemmel@astro.rug.nl

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© ESO 2001