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Astron. Astrophys. 319, 757-763 (1997)

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Beamed radio and far infrared emission in quasars and radio galaxies *

H. Hoekstra , P.D. Barthel and R. Hes

Kapteyn Astronomical Institute, P.O. Box 800, 9700 AV Groningen, The Netherlands

Received 20 June 1996 / Accepted 28 August 1996


Simple orientation model predictions for the radio to far infrared spectral energy distributions of radio-loud AGN are confronted with observations at various radio frequencies. This model is subsequently used to investigate 60 µm far-infrared data. The results are supportive of the unified scheme for Fanaroff-Riley class II radio galaxies and quasars. The relative strength of the beamed component is derived as a function of frequency, and it is found that the higher far infrared fluxes of quasars, as compared to radio galaxies, can be explained invoking moderately beamed nonthermal far-infrared emission.

Key words: galaxies: active – galaxies: jets – quasars: general – infrared: galaxies

* Data tables are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr ( or via http://cdsweb.u-strasbg.fr/Abstract.html

Send offprint requests to: P.D. Barthel

© European Southern Observatory (ESO) 1997

Online publication: July 3, 1998