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  Relative depolarization of the black hole photon ring in GRMHD models of Sgr A* and M87*

Jiménez-Rosales, A., Dexter, J., Ressler, S. M., Tchekhovskoy, A., Bauböck, M., Dallilar, Y., et al. (2021). Relative depolarization of the black hole photon ring in GRMHD models of Sgr A* and M87*. Monthly Notices of the Royal Astronomical Society, 503(3), 4563-4575. doi:10.1093/mnras/stab784.

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Jiménez-Rosales, A.1, Author              
Dexter, J.1, Author              
Ressler, S. M., Author
Tchekhovskoy, A., Author
Bauböck, M.1, Author              
Dallilar, Y.1, Author              
de Zeeuw, P. T.1, Author              
Drescher, A.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: Using general relativistic magnetohydrodynamic simulations of accreting black holes, we show that a suitable subtraction of the linear polarization per pixel from total intensity images can enhance the photon ring feature. We find that the photon ring is typically a factor of ≃2 less polarized than the rest of the image. This is due to a combination of plasma and general relativistic effects, as well as magnetic turbulence. When there are no other persistently depolarized image features, adding the subtracted residuals over time results in a sharp image of the photon ring. We show that the method works well for sample, viable GRMHD models of Sgr A* and M87*, where measurements of the photon ring properties would provide new measurements of black hole mass and spin, and potentially allow for tests of the ‘no-hair’ theorem of general relativity.

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Language(s): eng - English
 Dates: 2021-03-22
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/stab784
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Title: Monthly Notices of the Royal Astronomical Society
  Abbreviation : Mon. Not. Roy. Astron. Soc.
Source Genre: Journal
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Pages: - Volume / Issue: 503 (3) Sequence Number: - Start / End Page: 4563 - 4575 Identifier: ISSN: 0035-8711
ISSN: 1365-8711