Query : 2002A&A...387..422B

2002A&A...387..422B - Astronomy and Astrophysics, volume 387, 422-428 (2002/5-4)

Where have all the black holes gone?


Abstract (from CDS):

We have calculated stationary models for accretion disks around super-massive black holes in galactic nuclei. Our models show that below a critical mass flow rate of ∼3x10–3{dot}(M)Edd advection will dominate the energy budget while above that rate all the viscously liberated energy is radiated. The radiation efficiency declines steeply below that critical rate. This leads to a clear dichotomy between AGN and normal galaxies which is not so much given by differences in the mass flow rate as by the radiation efficiency. At very low mass accretion rates below 5x10–5{dot}(M)Edd synchrotron emission and Bremsstrahlung dominate the SED, while above 2x10–4{dot}(M)Edd the inverse Compton radiation from synchrotron seed photons produce flat to inverted SEDs from the radio to X-rays. Finally we discuss the implications of these findings for AGN duty cycles and the long-term AGN evolution.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - black hole physics - radiation mechanisms: non-thermal - galaxies: active - galaxies: nuclei

Simbad objects: 3

goto Full paper

goto View the references in ADS

Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2292 3
2 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13679 0
3 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4142 3

To bookmark this query, right click on this link: simbad:objects in 2002A&A...387..422B and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact