Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.322..614b&link_type=abstract
Nature (ISSN 0028-0836), vol. 322, Aug. 14, 1986, p. 614, 615. Research supported by the Ball Corp., Rockwell International Corp
Astronomy and Astrophysics
Astrophysics
25
Cooling Flows (Astrophysics), Elliptical Galaxies, Galactic Nuclei, Gas Cooling, Gas Flow, Interstellar Gas, Radio Galaxies, Black Holes (Astronomy), Schwarzschild Metric, Seyfert Galaxies, Spiral Galaxies
Scientific paper
One of the great puzzles in the study of active galaxies is the relationship between the properties of the nucleus and the large-scale morphology of the host galaxy. Galaxies which produce extended radio sources but little optical, ultraviolet or X-ray emission are invariably giant ellipticals or cD galaxies, whereas spirals tend to host "optically active" nuclei, such as Seyferts and at least some quasars. Rees and co-workers have interpreted this difference in radiative efficiency as a manifestation of the accretion flow close to the central black hole. But why should the mode of accretion at several Schwarzschild radii depend on the large-scale morphology of the host galaxy? The author argues here that the connection arises from the manner in which interstellar gas is fed into the nucleus.
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