EDP Sciences
Free access
Volume 379, Number 1, November III 2001
Page(s) L21 - L24
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20011348

A&A 379, L21-L24 (2001)
DOI: 10.1051/0004-6361:20011348

Broad-line radio galaxies: Old and feeble?

I. van Bemmel and P. Barthel

Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, The Netherlands

(Received 21 August 2001 / Accepted 27 September 2001 )

Far-infrared photometry of broad-line radio galaxies shows this class of AGN to consist of many hot and some cool infrared emitters, with peaks in their spectral energy distributions around 25 $\mu$m or longward of 60 $\mu$m, respectively. Quantitative analysis indicates that this distribution relates to a substantial dispersion in the strength of the cool dust component: broad-line radio galaxies are relatively poor in large-scale dust. Possibly they have undergone a different merger evolution, or are relatively old AGN.

Key words: galaxies: active -- infrared: galaxies -- quasars: general

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

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© ESO 2001