Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-12-22
Astronomy and Astrophysics
Astrophysics
6 pages, 3 figures. To appear in MNRAS
Scientific paper
10.1046/j.1365-8711.2000.03393.x
HST observations have shown that low-redshift 3CR radio galaxies often exhibit a point-like optical component positionally coincident with the GHz-frequency radio core. In this paper we discuss the correlation between the luminosities of the radio, optical and X-ray cores in these objects, and argue that all three components have a common origin at the base of the relativistic jets. In unified models, FRI radio galaxies should appear as dimmed, redshifted versions of BL Lac objects. We show that such models are consistent with the spectral energy distributions of the radio galaxies only if the nuclear X-ray emission in radio galaxies is inverse-Compton in origin.
Hardcastle Martin J.
Worrall Diana Mary
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