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  Scalar field effects on the orbit of S2 star

Amorim, A., Bauböck, M., Benisty, M., Berger, J.-P., Clénet, Y., du Forest, V. C., et al. (2019). Scalar field effects on the orbit of S2 star. Monthly Notices of the Royal Astronomical Society, 489(4), 4606-4621. doi:10.1093/mnras/stz2300.

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Amorim, A., Author
Bauböck, M.1, Author           
Benisty, M., Author
Berger, J.-P., Author
Clénet, Y., Author
du Forest, V. Coudé, Author
Zeeuw, T.1, Author           
Dexter, J.1, Author           
Duvert, G., Author
Eckart, A., Author
Eisenhauer, F.1, Author           
Ferreira, Miguel C., Author
Gao, F.1, Author           
Garcia, Paulo J. V., Author
Gendron, E., Author
Genzel, R.1, Author           
Gillessen, S.1, Author           
Gordo, P., Author
Habibi, M.1, Author           
Horrobin, M., Author
Jimenez Rosales, A.1, Author           Jocou, L., AuthorKervella, P., AuthorLacour, S.1, Author           Le Bouquin, J.-B., AuthorLéna, P., AuthorOtt, T.1, Author           Pössel, M., AuthorPaumard, T., AuthorPerraut, K., AuthorPerrin, G., AuthorPfuhl, O.1, Author           Coira, G. Rodriguez, AuthorRousset, G., AuthorStraub, O.1, Author           Straubmeier, C., AuthorSturm, E.1, Author           Vincent, F., AuthorFellenberg, S. von1, Author           Waisberg, I.1, Author           Widmann, F.1, Author            more..
Affiliations:
1Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              

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 Abstract: Precise measurements of the S-stars orbiting SgrA* have set strong constraints on the nature of the compact object at the centre of the Milky Way. The presence of a black hole in that region is well established, but its neighbouring environment is still an open debate. In that respect, the existence of dark matter in that central region may be detectable due to its strong signatures on the orbits of stars: the main effect is a Newtonian precession which will affect the overall pericentre shift of S2, the latter being a target measurement of the GRAVITY instrument. The exact nature of this dark matter (e.g. stellar dark remnants or diffuse dark matter) is unknown. This article assumes it to be a scalar field of toroidal distribution, associated with ultralight dark matter particles, surrounding the Kerr black hole. Such a field is a form of ‘hair’ expected in the context of superradiance, a mechanism that extracts rotational energy from the black hole. Orbital signatures for the S2 star are computed and shown to be detectable by GRAVITY. The scalar field can be constrained because the variation of orbital elements depends both on the relative mass of the scalar field to the black hole and on the field mass coupling parameter.

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 Dates: 2019-08-22
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/stz2300
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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 489 (4) Sequence Number: - Start / End Page: 4606 - 4621 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150