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Astronomical Institute 
Academy of Sciences of the Czech Republic
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Public lecture April 24, 2006


We invite you to the public lecture in Astronomical Institute, Academy of Science of the Czech Republic

Monday April 24, 2006
13:00

in the lecture room in Cosmic Laboratory Ondrejov 
 
 

Accretion onto massive black holes

Prof. Bozena Czerny (Copernicus Astronomical Center, Warsaw)

 
Accretion onto massive black holes is generally accepted as a way to power strong non-stellar emission from active galactic nuclei. However, our level of understanding of the flow pattern seems to be a decreasing function of the luminosity to the Eddington luminosity ratio. Standard disk accretion model is roughly satisfactory for bright quasars and some Narrow Line Seyfert 1 galaxies (L/L_Edd about 1), various models of hard X-ray emission can account for fainter quasars and Seyfert 1 galaxies (L/L_Edd about 0.01), although serious problems remain, the radiatively inefficient inflow/outflow with high angular momentum may, or may not, account for Low Luminosity AGN (L/L_Edd about 0.0001), and global flow pattern in the case of accretion onto Sgr A* remains an open question. I will argue that in this case low angular momentum flow offers a natural and attractive possibility.



Vladimir Karas 
organizer