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  A parameter survey of Sgr A* radiative models from GRMHD simulations with self-consistent electron heating

Dexter, J., Jiménez-Rosales, A., Ressler, S. M., Tchekhovskoy, A., Bauböck, M., de Zeeuw, P. T., et al. (2020). A parameter survey of Sgr A* radiative models from GRMHD simulations with self-consistent electron heating. Monthly Notices of the Royal Astronomical Society, 494(3), 4168-4186. doi:10.1093/mnras/staa922.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-AB58-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-AB59-6
Genre: Journal Article

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Dexter, J.1, Author              
Jiménez-Rosales, A.1, Author              
Ressler, S. M., Author
Tchekhovskoy, A, Author
Bauböck, M.1, Author              
de Zeeuw, P. T.1, Author              
Eisenhauer, F.1, Author              
Fellenberg, S. von1, Author              
Gao, F.1, Author              
Genzel, R.1, Author              
Gillessen, S.1, Author              
Habibi, M.1, Author              
Ott, T.1, Author              
Stadler, J.1, Author              
Straub, O.1, Author              
Widmann, F.1, Author              
Affiliations:
1Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              

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 Abstract: The Galactic centre black hole candidate Sgr A* is the best target for studies of low-luminosity accretion physics, including with near-infrared (NIR) and submillimetre wavelength long baseline interferometry experiments. Here, we compare images and spectra generated from a parameter survey of general relativistic MHD simulations to a set of radio to NIR observations of Sgr A*. Our models span the limits of weak and strong magnetization and use a range of sub-grid prescriptions for electron heating. We find two classes of scenarios can explain the broad shape of the submillimetre spectral peak and the highly variable NIR flaring emission. Weakly magnetized ‘disc-jet’ models where most of the emission is produced near the jet wall, consistent with past work, as well as strongly magnetized (magnetically arrested disc) models where hot electrons are present everywhere. Disc-jet models are strongly depolarized at submillimetre wavelengths as a result of strong Faraday rotation, inconsistent with observations of Sgr A*. We instead favour the strongly magnetized models, which provide a good description of the median and highly variable linear polarization signal. The same models can also explain the observed mean Faraday rotation measure and potentially the polarization signals seen recently in Sgr A* NIR flares.

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 Dates: 2020-04-07
 Publication Status: Published online
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 Rev. Method: Peer
 Identifiers: DOI: 10.1093/mnras/staa922
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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 494 (3) Sequence Number: - Start / End Page: 4168 - 4186 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150