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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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Modeling the orbital motion of Sgr As near-infrared flares.pdf (beliebiger Volltext), 2MB
 
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Bauböck, M.1, Autor           
Dexter, J., Autor
Abuter, R., Autor
Amorim, A., Autor
Berger, J. P., Autor
Bonnet, H., Autor
Brandner, W., Autor
Clénet, Y., Autor
du Foresto, V. Coudé, Autor
de Zeeuw, P. T.1, Autor           
Duvert, G., Autor
Eckart, A., Autor
Eisenhauer, F.1, Autor           
Förster Schreiber, N. M.1, Autor           
Gao, F.1, Autor           
Garcia, P., Autor
Gendron, E., Autor
Genzel, R.1, Autor           
Gerhard, O.2, Autor           
Gillessen, S.1, Autor           
Habibi, M.1, Autor           Haubois, X., AutorHenning, T., AutorHippler, S., AutorHorrobin, M., AutorJiménez-Rosales, A.1, Autor           Jocou, L., AutorKervella, P., AutorLacour, S.1, Autor           Lapeyrère, V., AutorLe Bouquin, J.-B., AutorLéna, P., AutorOtt, T.1, Autor           Paumard, T., AutorPerraut, K., AutorPerrin, G., AutorPfuhl, O.1, Autor           Rabien, S.1, Autor           Coira, G. Rodriguez, AutorRousset, G., AutorScheithauer, S., AutorStadler, J., AutorSternberg, A.1, Autor           Straub, O.1, Autor           Straubmeier, C., AutorSturm, E.1, Autor           Tacconi, L. J.1, Autor           Vincent, F., AutorFellenberg, S. von1, Autor           Waisberg, I., AutorWidmann, F.1, Autor           Wieprecht, E.1, Autor           Wiezorrek, E.1, Autor           Woillez, J., AutorYazici, S.1, Autor            mehr..
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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 Zusammenfassung: 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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Sprache(n): eng - English
 Datum: 2020-03-24
 Publikationsstatus: Online veröffentlicht
 Seiten: -
 Ort, Verlag, Ausgabe: -
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 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1051/0004-6361/201937233
Anderer: LOCALID: 3237865
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Titel: Astronomy and Astrophysics
  Andere : Astron. Astrophys.
Genre der Quelle: Zeitschrift
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Affiliations:
Ort, Verlag, Ausgabe: France : EDP Sciences S A
Seiten: - Band / Heft: 635 Artikelnummer: A143 Start- / Endseite: - Identifikator: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1