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  Dynamically important magnetic fields near the event horizon of Sgr A*

Jiménez-Rosales, A., Dexter, J., Widmann, F., Bauböck, M., Abuter, R., Amorim, A., et al. (2020). Dynamically important magnetic fields near the event horizon of Sgr A*. Astronomy and Astrophysics, 643: A56. doi:10.1051/0004-6361/202038283.

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Jiménez-Rosales, A.1, Author              
Dexter, J.1, Author              
Widmann, F.1, Author              
Bauböck, M.1, Author              
Abuter, R., Author
Amorim, A., Author
Berger, J. P., Author
Bonnet, H., Author
Brandner, W., Author
Clénet, Y., Author
de Zeeuw, P. T.1, Author              
Eckart, A., Author
Eisenhauer, F.1, Author              
Förster Schreiber, N. M.1, Author              
Garcia, P., Author
Gao, F.1, Author              
Gendron, E., Author
Genzel, R.1, Author              
Gillessen, S.1, Author              
Habibi, M.1, Author              
Haubois, X., AuthorHeißel, G., AuthorHenning, T., AuthorHippler, S., AuthorHorrobin, M., AuthorJochum, L., AuthorJocou, L., AuthorKaufer, A., AuthorKervella, P., AuthorLacour, S., AuthorLapeyrère, V., AuthorLe Bouquin, J.-B., AuthorLéna, P., AuthorNowak, M., AuthorOtt, T.1, Author              Paumard, T., AuthorPerraut, K., AuthorPerrin, G., AuthorPfuhl, O.1, Author              Rodríguez-Coira, G., AuthorShangguan, J.1, Author              Scheithauer, S., AuthorStadler, J.1, Author              Straub, O.1, Author              Straubmeier, C., AuthorSturm, E.1, Author              Tacconi, L. J.1, Author              Vincent, F., AuthorFellenberg, S. von1, Author              Waisberg, I.1, Author              Wieprecht, E.1, Author              Wiezorrek, E.1, Author              Woillez, J., AuthorYazici, S.1, Author              Zins, G., Author more..
Affiliations:
1Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              

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 Abstract: We study the time-variable linear polarisation of Sgr A* during a bright near-infrared flare observed with the GRAVITY instrument on July 28, 2018. Motivated by the time evolution of both the observed astrometric and polarimetric signatures, we interpret the data in terms of the polarised emission of a compact region (“hotspot”) orbiting a black hole in a fixed, background magnetic field geometry. We calculated a grid of general relativistic ray-tracing models, created mock observations by simulating the instrumental response, and compared predicted polarimetric quantities directly to the measurements. We take into account an improved instrument calibration that now includes the instrument’s response as a function of time, and we explore a variety of idealised magnetic field configurations. We find that the linear polarisation angle rotates during the flare, which is consistent with previous results. The hotspot model can explain the observed evolution of the linear polarisation. In order to match the astrometric period of this flare, the near horizon magnetic field is required to have a significant poloidal component, which is associated with strong and dynamically important fields. The observed linear polarisation fraction of ≃30% is smaller than the one predicted by our model (≃50%). The emission is likely beam depolarised, indicating that the flaring emission region resolves the magnetic field structure close to the black hole.

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Language(s): eng - English
 Dates: 2020-11-03
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1051/0004-6361/202038283
Other: LOCALID: 3284673
 Degree: -

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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 643 Sequence Number: A56 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1