Volume 372, Number 2, June III 2001
|Page(s)||386 - 390|
|Section||Cosmology (including clusters of galaxies)|
|Published online||15 June 2001|
Truncation of geometrically thin disks around massive black holes in galactic nuclei
Max-Planck-Institut für Astrophysik, Karl Schwarzschildstr. 1, 85740 Garching, Germany
2 Yunnan Observatory, Academia Sinica. PO Box 110, Kunming 650011, PR China
Corresponding author: E. Meyer-Hofmeister, firstname.lastname@example.org
Accepted: 16 March 2001
The concept of an advection-dominated accretion flow (ADAF), with or without wind loss, was used to describe the spectra of the galactic center source Sgr, low-luminosity AGN and nuclei of elliptical galaxies (including M 87). The spectral fits of various authors show that the transition from the geometrically thin disk to the hot flow occurs at quite different distances, apparently not uniquely related to the mass flow rate in the disk. We compare these results with the results of theoretical modeling where we determine the truncation of the thin outer disk from the efficiency of mass evaporation. The physics is the same as in the case of galactic black holes systems (Meyer et al. [CITE]b). For the observationally indicated mass flow rates our model predicts a truncation at 103 to 104 Schwarzschild radii. We discuss whether far inside this truncation an innermost cool thin disk could exist and affect the spectrum.
Key words: accretion disks / black hole physics / galaxies: nuclei / galaxies: individual: M 87, M 81 / X-rays: galaxies
© ESO, 2001
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.