2004A&A...428...39C


Query : 2004A&A...428...39C

2004A&A...428...39C - Astronomy and Astrophysics, volume 428, 39-49 (2004/12-2)

Constraints for the accretion disk evaporation rate in AGN from the existence of the Broad Line Region.

CZERNY B., ROZANSKA A. and KURASZKIEWICZ J.

Abstract (from CDS):

We analyze the consequences of the hypothesis that the formation of the Broad Line Region is intrinsically connected to the existence of the cold accretion disk. We assume that the Broad Line Region radius is reliably estimated by the formula of Kaspi et al. (2000ApJ...533..631K). We consider three models of the disappearance of the inner disk that limit the existence of the Broad Line Region: (i) the classical ADAF approach, i.e. the inner hot flow develops whenever it can exist; (ii) the disk evaporation model of Meyer & Meyer-Hofmeister (2002A&A...392L...5M); (iii) the generalized disk evaporation model of Rozanska & Czerny (2000A&A...360.1170R). For each of the models, we determine the minimum value of the Eddington ratio and the maximum value of the broad line widths as functions of the viscosity parameter α and the magnetic field parameter β. We compare the predicted parameter space with observations of several AGN. Weak dependence of the maximum value of the FWHM and minimum value of the Eddington ratio on the black hole mass in our sample is noticeable. It seems to favor the description of the cold disk/hot inner flow transition as in the classical ADAF approach rather than with the model of disk evaporation due to conduction between the disk and accreting corona.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - galaxies: active - galaxies: Seyfert - X-rays: galaxies - quasars: emission lines

Simbad objects: 6

goto Full paper

goto View the references in ADS

Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NGC 3227 Sy1 10 23 30.5765149296 +19 51 54.282206700   12.61 11.79     ~ 1701 1
2 NGC 3516 Sy1 11 06 47.4632200800 +72 34 07.298374656   13.12 12.40     ~ 1540 0
3 PB 3894 Sy1 12 14 17.6738687784 +14 03 13.182723144   14.46 14.19     ~ 821 0
4 NGC 4253 Sy1 12 18 26.5163572920 +29 48 46.531535472   14.34 13.57     ~ 1039 1
5 ESO 383-35 Sy1 13 35 53.7691256160 -34 17 44.160716796   13.89 13.61 8.9   ~ 1482 0
6 NGC 5548 Sy1 14 17 59.5400291832 +25 08 12.603122268   14.35 13.73     ~ 2708 0

To bookmark this query, right click on this link: simbad:objects in 2004A&A...428...39C and select 'bookmark this link' or equivalent in the popup menu