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2000MNRAS.311...23B - Mon. Not. R. Astron. Soc., 311, 23-36 (2000/January-1)
Ionization, shocks and evolution of the emission-line gas of distant 3CR radio galaxies.
BEST P.N., ROETTGERING H.J.A. and LONGAIR M.S.
Abstract (from CDS):
The emission-line ratios of small radio sources are in agreement with theoretical shock ionization predictions, and their velocity profiles are distorted. Together with the other emission-line properties, this indicates that shocks associated with the radio source dominate the kinematics and ionization of the emission-line gas during the period that the radio source is expanding through the interstellar medium. Gas clouds are accelerated by the shocks, giving rise to the irregular velocity structures observed, whilst shock compression of emission-line gas clouds and the presence of the ionizing photons associated with the shocks combine to lower the ionization state of the emission-line gas. By contrast, in larger sources the shock fronts have passed well beyond the emission-line regions; the emission-line gas of these larger radio sources has much more settled kinematical properties, indicative of rotation, and emission-line ratios consistent with the dominant source of ionizing photons being the active galactic nucleus.
This strong evolution with radio size of the emission-line gas properties of powerful radio galaxies mirrors the radio size evolution seen in the nature of the optical-ultraviolet continuum emission of these sources, implying that the continuum alignment effect is likely to be related to the same radio source shocks.
Abstract Copyright: 2000, Royal Astronomical Society
Journal keyword(s): shock waves - galaxies: active - galaxies: ISM - radio continuum: galaxies
Simbad objects: 33
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