Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.240..225t&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 240, Sept. 1, 1989, p. 225-254.
Astronomy and Astrophysics
Astronomy
89
Emission Spectra, Gas Dynamics, Gravitational Effects, Intergalactic Media, Line Spectra, Radio Galaxies, Accretion Disks, Chaos, Galactic Evolution, Radial Velocity, Radio Jets (Astronomy)
Scientific paper
Kinematic data on the extended emission line regions (EELR) around 14 powerful, low-redshift radio galaxies are presented. The structures and kinematics of the EELR cover the full range from regular disk/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 between 50 and 400 km/s. The gas motions appear to be predominantly gravitational. For many galaxies, the high angular momentum of the disk/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.
Fosbury Robert A. E.
Quinn Peter J.
Tadhunter Clive N.
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