2016ApJ...818...82Z


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.19CEST15:44:33

2016ApJ...818...82Z - Astrophys. J., 818, 82 (2016/February-2)

Intrinsic electromagnetic variability in celestial objects containing rapidly spinning black holes.

ZHANG F.

Abstract (from CDS):

Analytical studies have raised the concern that a mysterious expulsion of magnetic field lines by a rapidly spinning black hole (dubbed the black hole Meissner effect) would shut down the Blandford-Znajek process and quench the jets of active galactic nuclei and microquasars. This effect is, however, not seen observationally or in numerical simulations. Previous attempts at reconciling the predictions with observations have proposed several mechanisms to evade the Meissner effect. In this paper, we identify a new evasion mechanism and discuss its observational significance. Specifically, we show that the breakdown of stationarity is sufficient to remove the expulsion of the magnetic field at all multipole orders, and that the associated temporal variation is likely turbulent because of the existence of efficient mechanisms for sharing energy across different modes. Such an intrinsic (as opposed to being driven externally by, e.g., changes in the accretion rate) variability of the electromagnetic field can produce the recorded linear correlation between microvariability amplitudes and mean fluxes, help create magnetic randomness and seed sheared magnetic loops in jets, and lead to a better theoretical fit to the X-ray microvariability power spectral density.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: jets - galaxies: magnetic fields

Simbad objects: 6

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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 - 2021
#notes
1 NGC 4151 Sy1 12 10 32.5771747733 +39 24 21.057727323   12.18 11.48     ~ 3442 2
2 [GHJ2008] 3 HXB 16 50 00.980 -49 57 43.60     11.89     K4V 358 0
3 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2361 0
4 87GB 192453.6+420352 BLL 19 26 31.0532781 +42 09 58.989107           ~ 42 1
5 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3997 0
6 QSO B2155-304 BLL 21 58 52.0651817803 -30 13 32.120657891   13.36 13.09 12.62   ~ 1598 1

    Equat.    Gal    SGal    Ecl

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2021.04.19-15:44:33

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