Open AccessRadio, optical and X‐ray nuclei in nearby 3CRR radio galaxies
Author(s) -
Hardcastle M. J.,
Worrall D. M.
Publication year - 2000
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2000.03393.x
Subject(s) - physics , astrophysics , radio galaxy , x shaped radio galaxy , redshift , astronomy , galaxy
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, FR I 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.