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2000MNRAS.317..922R - Mon. Not. R. Astron. Soc., 317, 922-936 (2000/October-1)
Testing the photoionization models of powerful radio galaxies: mixed line-emitting media in 3C 321.
ROBINSON T.G., TADHUNTER C.N., AXON D.J. and ROBINSON A.
Abstract (from CDS):
The emission-line kinematics, line ratios and deduced physical conditions show remarkably little variation across the source. We deduce a mean electron density of 400±120cm–3 and a mean temperature of 11500±1500K. Assuming a single population of optically thick line-emitting clouds, we calculate a mean photoionization parameter of (1.1±0.5)x10–2, and hence a photoionizing photon luminosity of Q∼1055-1056photons–1.sr–1. This indicates a central engine as luminous as that of the powerful quasar 3C 273, yet there is no evidence for such an energetically prolific central engine at either far-infrared or radio wavelengths. We therefore conclude that the mixed-medium models, which give Q∼5x1053-5x1054photons–1.sr–1 represent a more likely scenario.
As a by-product of the continuum subtraction, we infer that young stellar populations account for ∼0.4per cent of the visible stellar mass in the galaxy, and that these populations are spatially extended.
Abstract Copyright: 2000, Royal Astronomical Society
Journal keyword(s): line: formation - galaxies: active - galaxies: individual: 3C 321 - quasars: emission lines - galaxies: stellar content
Simbad objects: 3
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