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Title: ACCRETION OF SUPERSONIC WINDS ONTO BLACK HOLES IN 3D: STABILITY OF THE SHOCK CONE

Abstract

Using numerical simulations we present the accretion of supersonic winds onto a rotating black hole in three dimensions. We study five representative directions of the wind with respect to the axis of rotation of the black hole and focus on the evolution and stability of the high-density shock cone that is formed during the process. We explore both the regime in which the shock cone is expected to be stable in order to confirm previous results obtained with two-dimensional simulations, and the regime in which the shock cone is expected to show a flip–flop (FF) type of instability. The methods used to attempt a triggering of the instability were (i) the accumulation of numerical errors and (ii) the explicit application of a perturbation on the velocity field after the shock cone was formed. The result is negative, that is, we did not find the FF instability within the parameter space we explored, including cases that are expected to be unstable.

Authors:
;  [1]
  1. Instituto de Física y Matemáticas, Universidad Michoacana de San Nicolás de Hidalgo. Edificio C-3, Cd. Universitaria, 58040 Morelia, Michoacán, México (Mexico)
Publication Date:
OSTI Identifier:
22518863
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 812; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCRETION DISKS; BLACK HOLES; COMPUTERIZED SIMULATION; CONES; DENSITY; DISTURBANCES; INSTABILITY; ROTATION; SPACE; STELLAR WINDS; VELOCITY

Citation Formats

Gracia-Linares, M., and Guzmán, F. S. ACCRETION OF SUPERSONIC WINDS ONTO BLACK HOLES IN 3D: STABILITY OF THE SHOCK CONE. United States: N. p., 2015. Web. doi:10.1088/0004-637X/812/1/23.
Gracia-Linares, M., & Guzmán, F. S. ACCRETION OF SUPERSONIC WINDS ONTO BLACK HOLES IN 3D: STABILITY OF THE SHOCK CONE. United States. https://doi.org/10.1088/0004-637X/812/1/23
Gracia-Linares, M., and Guzmán, F. S. 2015. "ACCRETION OF SUPERSONIC WINDS ONTO BLACK HOLES IN 3D: STABILITY OF THE SHOCK CONE". United States. https://doi.org/10.1088/0004-637X/812/1/23.
@article{osti_22518863,
title = {ACCRETION OF SUPERSONIC WINDS ONTO BLACK HOLES IN 3D: STABILITY OF THE SHOCK CONE},
author = {Gracia-Linares, M. and Guzmán, F. S.},
abstractNote = {Using numerical simulations we present the accretion of supersonic winds onto a rotating black hole in three dimensions. We study five representative directions of the wind with respect to the axis of rotation of the black hole and focus on the evolution and stability of the high-density shock cone that is formed during the process. We explore both the regime in which the shock cone is expected to be stable in order to confirm previous results obtained with two-dimensional simulations, and the regime in which the shock cone is expected to show a flip–flop (FF) type of instability. The methods used to attempt a triggering of the instability were (i) the accumulation of numerical errors and (ii) the explicit application of a perturbation on the velocity field after the shock cone was formed. The result is negative, that is, we did not find the FF instability within the parameter space we explored, including cases that are expected to be unstable.},
doi = {10.1088/0004-637X/812/1/23},
url = {https://www.osti.gov/biblio/22518863}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 812,
place = {United States},
year = {Sat Oct 10 00:00:00 EDT 2015},
month = {Sat Oct 10 00:00:00 EDT 2015}
}