Issue |
A&A
Volume 372, Number 2, June III 2001
|
|
---|---|---|
Page(s) | 386 - 390 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361:20010405 | |
Published online | 15 June 2001 |
Truncation of geometrically thin disks around massive black holes in galactic nuclei
1
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, emm@mpa-garching.mpg.de
Received:
22
November
2000
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
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