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26 April 2024 |
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Shocks, illumination cones and intrinsic gas structures in the extreme radio galaxy 3C265 | | C. Solorzano-Inarrea
; C. Tadhunter
; J. Bland-Hawthorn
; | | Date: |
10 Dec 2001 | | Journal: | Mon.Not.Roy.Astron.Soc. 331 (2002) 673 | | Subject: | astro-ph | | Affiliation: | IfA Edinburgh / Sheffield), C. Tadhunter (Sheffield), J. Bland-Hawthorn (AAO | | Abstract: | 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). | | Source: | arXiv, astro-ph/0112234 | | Services: | Forum | Review | PDF | Favorites | |
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