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- W2000083647 abstract "New kinematic data on the extended emission line regions (EELR) around 14 powerful, low-redshift |$(zlt0.4)$| radio galaxies are presented. The structures and kinematics of the EELR cover the full range from regular disc/ring systems to chaotic systems for which no pattern can be discerned. In most cases the radial velocity differences of individual components relative to the nuclei cover the range |$50lt|Delta{V}^text{max}|lt400,text{km s}^{-1}.$| The gas motions appear to be predominantly gravitational, although we note that the three systems with the largest values of |$|Delta{V}^text{max}|$| show signs of interaction with radio jets. If interpreted as gravitationally induced circular rotation, the velocity amplitudes are smaller than expected from the mass distributions for early-type galaxies derived using other dynamic tracers (stellar velocity dispersions; X-ray coronae), but are about the same as observed in spiral galaxies. This implies that either some of the assumptions used in applying the tracers are wrong (e.g. the X-ray haloes are not isothermal), or that radio galaxies are less massive than normal early-type galaxies of similar absolute magnitude. For many galaxies, the high angular momentum of the disc/ring structures is evidence against the gas originating in a low-angular-momentum cooling flow. Although cooling flows may be important sources of EELR for some galaxies with high-X-ray cooling rates, irregular structures and low velocity amplitudes, accretion from an external source is the most likely origin for the gas in most of the radio galaxies. Accretion is independently supported by the presence of stellar shells, loops and tails and the misalignments between stellar and gaseous dynamical axes observed in some cases. Such accretion may be part of the overall galaxy formation process. Independent of the exact origin, the process of dissipational settling to a steady dynamical state will inevitably lead to an infall of gas to the nucleus. This infall will be capable of fuelling the radio source for the time-scale required by the extended radio structures |$({10}^{7}-{10}^{8},text{yr})$|." @default.
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- W2000083647 date "1989-09-01" @default.
- W2000083647 modified "2023-09-24" @default.
- W2000083647 title "The kinematics of the ionized gas around powerful radio galaxies" @default.
- W2000083647 doi "https://doi.org/10.1093/mnras/240.2.225" @default.
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