English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  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.

Item is

Files

show Files
hide Files
:
A parameter survey of Sgr A radiative models from GRMHD simulations with self-consistent electron heating.pdf (Any fulltext), 5MB
 
File Permalink:
-
Name:
A parameter survey of Sgr A radiative models from GRMHD simulations with self-consistent electron heating.pdf
Description:
-
OA-Status:
Visibility:
Private
MIME-Type / Checksum:
application/pdf
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Locators

show

Creators

show
hide
 Creators:
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              

Content

show
hide
Free keywords: -
 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.

Details

show
hide
Language(s):
 Dates: 2020-04-07
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/staa922
Other: LOCALID: 3241879
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
 Creator(s):
Affiliations:
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