Unformatted text preview: Radiatively inefficient AGN There exists a class of 'radiatively inefficient' solutions to the equations that govern accretion. The most widely known of these is the Advection Dominated Accretion Flow (ADAF),  but others exist. In this type of accretion, which is important for accretion rates well below the Eddington limit , the accreting matter does not form a thin disc and consequently does not radiate away the energy that it has acquired in moving close to the black hole. Radiatively inefficient accretion has been used to explain the lack of strong AGN-type radiation from massive black holes in the centres of elliptical galaxies in clusters, where otherwise we might expect high accretion rates and corresponding high luminosities.  Radiatively inefficient AGN would be expected to lack many of the characteristic features of standard AGN with an accretion disc....
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- Fall '10
- Astronomy, Black hole, jets, accretion discs, Radiatively inefficient AGN, Advection Dominated Accretion, accretion rates