Shocks, illumination cones and intrinsic gas structures in the extreme radio galaxy 3C265

Details Shocks, illumination cones and intrinsic gas structures in the extreme radio galaxy 3C265 Shocks, illumination cones and intrinsic gas structures in the extreme radio galaxy 3C265

2001-12-10

arxiv.org/abs/astro-ph/0112234v1

Mon.Not.Roy.Astron.Soc.331:673,2002

Astronomy and Astrophysics

Astrophysics

12 pages, including 6 figures, MNRAS in press

Scientific paper

10.1046/j.1365-8711.2002.05231.x

We present deep, narrow-band and continuum images of the powerful z=0.811 radio galaxy 3C265, taken with the TTF on the WHT, together with detailed long-slit spectroscopic observations along the axis defined by the UV/optical emission elongation. The deep images reveal the existence of cones in the ionization structure within ~7 arcsec (58 kpc) of the nucleus, where the emission-line structure is not closely aligned with the radio axis. This indicates that anisotropic illumination from the central AGN dominates on a small scale. At larger distances (>10 arcsec) from the nucleus, low-ionization emission gas is closely aligned with the radio axis, suggesting that jet-cloud interactions may be the dominant mechanism in the line-emitting gas on a larger scale. Moreover, the presence of a high-velocity cloud at 2.5 arcsec from the nucleus, close to the radio axis, indicates that even close to the nucleus jet-induced shocks have an important kinematic effect. While on a large scale the low-ionization emission-line structures are aligned with the radio axis, on a smaller scale, where AGN-photoionization dominates, the highest surface brightness structure is aligned with the closest companion galaxy. This suggest that much of the emission-line structure reflects the intrinsic gas distribution, rather than the ionization pattern imprinted by the radio jets or by AGN illumination. Overall, our results underline the need for a variety of mechanisms to explain the properties of the extended emission-line gas of radio galaxies (abridged).

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