The parsec-scale central components of FR I radio galaxies

Details The parsec-scale central components of FR I radio galaxies The parsec-scale central components of FR I radio galaxies

2000-12-21

arxiv.org/abs/astro-ph/0012461v1

Astronomy and Astrophysics

Astrophysics

4 pages (including 4 figures) to be published in 'Particles and Fields in Radio Galaxies', an ASP Conference Series on the pro

Scientific paper

A majority of a complete sample of 3CR FR I radio galaxies show unresolved optical nuclear sources on the scales of 0.1 arcsec. About half of the 3CR FR II radio galaxies observed with the HST also show Compact Central Cores (CCC). These CCCs have been interpreted as the optical counterparts of the non-thermal radio cores in these radio galaxies (Chiaberge, Capetti, & Celotti 1999). We show that the optical flux density of the CCCs in FR Is is correlated with the radio core prominence. This correlation supports the argument of Chiaberge et al. that the CCC radiation is of a non-thermal synchrotron origin, which is relativistically beamed along with the radio emission.

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