Scalar field effects on the orbit of S2 star

• Type: Article in International Scientific Journal
• Date: 2019

Authors

Amorim, A (Author) Other; Bauboeck, M (Author) Other; Benisty, M (Author) Other; Berger, JP (Author) Other; Clenet, Y (Author) Other; du Forest, VC (Author) Other; de Zeeuw, T (Author) Other; Dexter, J (Author) Other; Duvert, G (Author) Other; Eckart, A (Author) Other; Eisenhauer, F (Author) Other; Ferreira, MC (Author) Other; Gao, F (Author) Other; P. J. V. Garcia (Author) FEUP; Gendron, E (Author) Other; Genzel, R (Author) Other; Gillessen, S (Author) Other; Gordo, P (Author) Other; Habibi, M (Author) Other; Horrobin, M (Author) Other; Jimenez Rosales, A (Author) Other; Jocou, L (Author) Other; Kervella, P (Author) Other; Lacour, S (Author) Other; Le Bouquin, JB (Author) Other; Lena, P (Author) Other; Ott, T (Author) Other; Poessel, M (Author) Other; Paumard, T (Author) Other; Perraut, K (Author) Other; Perrin, G (Author) Other; Pfuhl, O (Author) Other; Coira, GR (Author) Other; Rousset, G (Author) Other; Straub, O (Author) Other; Straubmeier, C (Author) Other; Sturm, E (Author) Other; Vincent, F (Author) Other; von Fellenberg, S (Author) Other; Waisberg, I (Author) Other; Widmann, F (Author) Other

Journal

Title: Monthly Notices of the Royal Astronomical Society

Vol. 489

Pages: 4606-4621

ISSN: 0035-8711

Publisher: Oxford University Press

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 7 Citations

Other information

Authenticus ID: P-00R-5MD

DOI: 10.1093/mnras/stz2300

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 16