Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 513, Issue 4, Pages 5818-5828Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stac1348
Keywords
accretion; accretion discs; black hole physics; galaxies: nuclei; methods: numerical
Categories
Funding
- Natural Science Foundation of China [12173065, 12133008, 12192220, 12192223]
- China Manned Space Project [CMS-CSST-2021-B02]
Ask authors/readers for more resources
This study demonstrates through MHD simulations with different thermal treatments that the isothermal and adiabatic models overestimate the temperature and underestimate the power of disc winds, and cannot predict the local structure of the winds. Compared to the model with radiative cooling and heating, the pure MHD winds cannot interpret all the observed ultra-fast outflows.
Winds are commonly observed in luminous active galactic nuclei. A plausible model of those winds is magnetohydrodynamic (MHD) disc winds. In the case of disc winds from a thin accretion disc, isothermal or adiabatic assumption is usually adopted in such MHD models. In this work, we perform two-dimensional MHD simulations implementing different thermal treatments (isothermal, adiabatic, and radiative) to study their effects on winds from a thin accretion disc. We find that both the isothermal model and the adiabatic model overestimate the temperature, underestimate the power of disc winds, and cannot predict the local structure of the winds, compared to the results obtained by solving the energy equation with radiative cooling and heating. Based on the model with radiative cooling and heating, the ionization parameter, the column density, and the velocity of the disc winds have been compared to the observed ultra-fast outflows (UFOs). We find that in our simulations the UFOs can only be produced inside hundreds of Schwarzschild radius. At much larger radii, no UFOs are found. Thus, the pure MHD winds cannot interpret all the observed UFOs.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available