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  Modeling the orbital motion of Sgr A*’s near-infrared flares

Bauböck, M., Dexter, J., Abuter, R., Amorim, A., Berger, J. P., Bonnet, H., et al. (2020). Modeling the orbital motion of Sgr A*’s near-infrared flares. Astronomy and Astrophysics, 635: A143. doi:10.1051/0004-6361/201937233.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-8DAC-A Version Permalink: http://hdl.handle.net/21.11116/0000-0006-8DAD-9
Genre: Journal Article

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Bauböck, M.1, Author              
Dexter, J., Author
Abuter, R., Author
Amorim, A., Author
Berger, J. P., Author
Bonnet, H., Author
Brandner, W., Author
Clénet, Y., Author
du Foresto, V. Coudé, Author
de Zeeuw, P. T.1, Author              
Duvert, G., Author
Eckart, A., Author
Eisenhauer, F.1, Author              
Förster Schreiber, N. M.1, Author              
Gao, F.1, Author              
Garcia, P., Author
Gendron, E., Author
Genzel, R.1, Author              
Gerhard, O.2, Author              
Gillessen, S.1, Author              
Habibi, M.1, Author              Haubois, X., AuthorHenning, T., AuthorHippler, S., AuthorHorrobin, M., AuthorJiménez-Rosales, A.1, Author              Jocou, L., AuthorKervella, P., AuthorLacour, S.1, Author              Lapeyrère, V., AuthorLe Bouquin, J.-B., AuthorLéna, P., AuthorOtt, T.1, Author              Paumard, T., AuthorPerraut, K., AuthorPerrin, G., AuthorPfuhl, O.1, Author              Rabien, S.1, Author              Coira, G. Rodriguez, AuthorRousset, G., AuthorScheithauer, S., AuthorStadler, J., AuthorSternberg, A.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., AuthorWidmann, F.1, Author              Wieprecht, E.1, Author              Wiezorrek, E.1, Author              Woillez, J., AuthorYazici, S.1, Author               more..
Affiliations:
1Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              
2Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159895              

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 Abstract: Infrared observations of Sgr A* probe the region close to the event horizon of the black hole at the Galactic center. These observations can constrain the properties of low-luminosity accretion as well as that of the black hole itself. The GRAVITY instrument at the ESO VLTI has recently detected continuous circular relativistic motion during infrared flares which has been interpreted as orbital motion near the event horizon. Here we analyze the astrometric data from these flares, taking into account the effects of out-of-plane motion and orbital shear of material near the event horizon of the black hole. We have developed a new code to predict astrometric motion and flux variability from compact emission regions following particle orbits. Our code combines semi-analytic calculations of timelike geodesics that allow for out-of-plane or elliptical motions with ray tracing of photon trajectories to compute time-dependent images and light curves. We apply our code to the three flares observed with GRAVITY in 2018. We show that all flares are consistent with a hotspot orbiting at R ∼ 9 gravitational radii with an inclination of i ∼ 140°. The emitting region must be compact and less than ∼5 gravitational radii in diameter. We place a further limit on the out-of-plane motion during the flare.

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Language(s): eng - English
 Dates: 2020-03-24
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1051/0004-6361/201937233
Other: LOCALID: 3237865
 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: 635 Sequence Number: A143 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1