Other
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ssct...18..103b&link_type=abstract
Specul. Sci. Technol., Vol. 18, No. 2, p. 103 - 108
Other
Radio Galaxies: Structure, Spiral Galaxies: Differential Rotation, Galaxies: Spiral Structure
Scientific paper
Torus structures are believed to be a common feature in active galaxies. Differential rotation is thought to generate high frictional dissipation in accretion tori feeding active galactic nuclei. However, one configuration is described where the torus executes a collective motion which is stable and which produces very little friction. Individual particles in this torus move in a manner which resembles Keplerian elliptical orbits around the galactic centre. Evidence is presented for the dust lane of the radio galaxy Cen A being a torus with this 'low-loss' motion. The configuration is then applied to the arms of spiral galaxies, the observed departures from circular orbits are explained in terms of rotating spiral arms. Observations of 'non-circular streaming motions' of typically ±15 km s-1 in both the Galaxy and in M51 fit the rotating arm model very well. Other direct evidence for the rotation of spiral arms, including the local-Orion arm, is discussed. The model also provides a natural explanation for supporting gas above and below the galactic plane to form a thick disk.
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