2007A&A...466..793J


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.16CEST14:19:56

2007A&A...466..793J - Astronomy and Astrophysics, volume 466, 793-803 (2007/5-2)

Accreting corona model of the X-ray variability in soft state X-ray binaries and active galactic nuclei.

JANIUK A. and CZERNY B.

Abstract (from CDS):

We develop a two-flow model of accretion onto a black hole which incorporates the effect of the local magneto-rotational instability. The flow consists of an accretion disk and an accreting corona, and the local dynamo affects the disk/corona mass exchange. The model is aimed to explain the power spectrum density of the sources in their soft, disk-dominated states. The local perturbations of the magnetic field in the disk are described as in King et al. (2004MNRAS.348..111K) and Mayer & Pringle (2006MNRAS.368..379M), but the time-dependent local magnetic field is assumed to affect the local supply of the material to the corona. Since the viscous timescale in the corona is much shorter than in the disk, the local perturbations are not smeared in the corona. Simple analytical estimates and full time-dependent computations of the disk-corona system are performed. The accreting corona model can reproduce the broad power spectra of Soft State X-ray binaries and AGN. The model, however, predicts that (i) sources undergoing radiation pressure instability (GRS 1915+105) should have systematically steeper power spectra than other sources, (ii) AGN should have systematically steeper power spectra than GBH, even if their disks are described using viscosity proportional to the gas pressure. More precise measurements of power spectra of Soft State sources are clearly needed.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - X-rays: binaries - galaxies: active - galaxies: Seyfert - stars: binaries: close - X-rays: galaxies

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 X LMC X-1 HXB 05 39 38.8285930597 -69 44 35.533031148   14.8 14.5     O8(f)p 576 2
2 NGC 4051 Sy1 12 03 09.6098828919 +44 31 52.693714606   11.08 12.92 9.94   ~ 2034 1
3 NGC 4253 Sy1 12 18 26.5155239433 +29 48 46.518670434   14.34 13.57     ~ 952 1
4 ESO 383-35 Sy1 13 35 53.7686909139 -34 17 44.139127597   13.89 13.61 8.9   ~ 1400 0
5 NGC 5506 AGN 14 13 14.901 -03 12 27.22   15.25 14.38     ~ 1015 0
6 [GHJ2008] 3 HXB 16 50 00.980 -49 57 43.60     11.89     K4V 358 0
7 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2361 0
8 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3997 0
9 UGC 12163 Sy1 22 42 39.3364258078 +29 43 31.301194419   14.86 14.16     ~ 632 1

    Equat.    Gal    SGal    Ecl

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