Revision of Two-temperature Magnetically Arrested Flows onto a Black Hole
We revisit the radiative properties of 3D general relativistic magnetohydrodynamics (GRMHD) two-temperature magnetically arrested disk (MAD) models in which electrons are heated by a magnetic turbulent cascade. We focus on studying the model emission, whose characteristics include variability in bot...
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/adb1a7 |
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| author | M. Mościbrodzka |
| author_facet | M. Mościbrodzka |
| author_sort | M. Mościbrodzka |
| collection | DOAJ |
| description | We revisit the radiative properties of 3D general relativistic magnetohydrodynamics (GRMHD) two-temperature magnetically arrested disk (MAD) models in which electrons are heated by a magnetic turbulent cascade. We focus on studying the model emission, whose characteristics include variability in both total intensity and linear/circular polarizations as well as rotation measures at energies around the synchrotron emission peak in millimeter waves. We find that the radiative properties of MAD models with turbulent electron heating are well converged with respect to the numerical grid resolution, which has not been demonstrated before. We compare radiation from two-temperature simulations with turbulent heating to single-temperature models with electron temperatures calculated based on the commonly used R ( β ) prescription. We find that the self-consistent two-temperature models with turbulent heating do not significantly outperform the R ( β ) models and, in practice, may be indistinguishable from the R ( β ) models. Accounting for physical effects such as radiative cooling and the nonthermal electron distribution function makes a weak impact on properties of millimeter emission. Models are scaled to Sgr A*, an accreting black hole in the center of our galaxy, and compared to the most complete observational data sets. We point out the consistencies and inconsistencies between the MAD models and observations of this source and discuss future prospects for GRMHD simulations. |
| format | Article |
| id | doaj-art-dc932b42e7ce4c0a9270d2842c123389 |
| institution | OA Journals |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal |
| spelling | doaj-art-dc932b42e7ce4c0a9270d2842c1233892025-08-20T02:14:27ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01981214510.3847/1538-4357/adb1a7Revision of Two-temperature Magnetically Arrested Flows onto a Black HoleM. Mościbrodzka0https://orcid.org/0000-0002-4661-6332Department of Astrophysics/IMAPP, Radboud University , P.O. Box 9010, 6500 GL Nijmegen, The Netherlands ; m.moscibrodzka@astro.ru.nlWe revisit the radiative properties of 3D general relativistic magnetohydrodynamics (GRMHD) two-temperature magnetically arrested disk (MAD) models in which electrons are heated by a magnetic turbulent cascade. We focus on studying the model emission, whose characteristics include variability in both total intensity and linear/circular polarizations as well as rotation measures at energies around the synchrotron emission peak in millimeter waves. We find that the radiative properties of MAD models with turbulent electron heating are well converged with respect to the numerical grid resolution, which has not been demonstrated before. We compare radiation from two-temperature simulations with turbulent heating to single-temperature models with electron temperatures calculated based on the commonly used R ( β ) prescription. We find that the self-consistent two-temperature models with turbulent heating do not significantly outperform the R ( β ) models and, in practice, may be indistinguishable from the R ( β ) models. Accounting for physical effects such as radiative cooling and the nonthermal electron distribution function makes a weak impact on properties of millimeter emission. Models are scaled to Sgr A*, an accreting black hole in the center of our galaxy, and compared to the most complete observational data sets. We point out the consistencies and inconsistencies between the MAD models and observations of this source and discuss future prospects for GRMHD simulations.https://doi.org/10.3847/1538-4357/adb1a7Supermassive black holesMagnetohydrodynamical simulationsLow-luminosity active galactic nucleiPlasma physics |
| spellingShingle | M. Mościbrodzka Revision of Two-temperature Magnetically Arrested Flows onto a Black Hole The Astrophysical Journal Supermassive black holes Magnetohydrodynamical simulations Low-luminosity active galactic nuclei Plasma physics |
| title | Revision of Two-temperature Magnetically Arrested Flows onto a Black Hole |
| title_full | Revision of Two-temperature Magnetically Arrested Flows onto a Black Hole |
| title_fullStr | Revision of Two-temperature Magnetically Arrested Flows onto a Black Hole |
| title_full_unstemmed | Revision of Two-temperature Magnetically Arrested Flows onto a Black Hole |
| title_short | Revision of Two-temperature Magnetically Arrested Flows onto a Black Hole |
| title_sort | revision of two temperature magnetically arrested flows onto a black hole |
| topic | Supermassive black holes Magnetohydrodynamical simulations Low-luminosity active galactic nuclei Plasma physics |
| url | https://doi.org/10.3847/1538-4357/adb1a7 |
| work_keys_str_mv | AT mmoscibrodzka revisionoftwotemperaturemagneticallyarrestedflowsontoablackhole |