Bars within bars - A mechanism for fuelling active galactic nuclei

Details Bars within bars - A mechanism for fuelling active galactic nuclei Bars within bars - A mechanism for fuelling active galactic nuclei

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989natur.338...45s&link_type=abstract

Nature (ISSN 0028-0836), vol. 338, March 2, 1989, p. 45-47. Research supported by NASA, NSF, Ball Aerospace Corp., Rockwell Inte

Astronomy and Astrophysics

Astronomy

450

Accretion Disks, Active Galactic Nuclei, Black Holes (Astronomy), Interstellar Matter, Seyfert Galaxies, Starburst Galaxies, Charge Coupled Devices, H Ii Regions, Kinetic Energy

Scientific paper

A mechanism, applicable to AGN and nuclear starburst galaxies in which there is accretion onto a supermassive black hole (SBH), is proposed which brings in gas from large to small scales by successive dynamical instabilities. On the large scale, a stellar bar sweeps the interstellar medium into a gaseous disk a few hundred pc in radius. Under certain conditions, this disk can become unstable again, allowing material to flow inwards until turbulent viscous processes control angular-momentum transport. This flow pattern may feed viscosity-driven accretion flows around an SBH or lead to the formation of an SBH if none was present initially.

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