The Galactic Centre star S2 as a dynamical probe for intermediate-mass black holes

Abstract

We study the short-term effects of an intermediate mass black hole (IBH) on the orbit of star S2 (S02), the shortest-period star known to orbit the supermassive black hole (MBH) in the centre of the Milky Way. Near-infrared imaging and spectroscopic observations allow an accurate determination of the orbit of the star. Given S2's short orbital period and large eccentricity, general relativity (GR) needs to be taken into account, and its effects are potentially measurable with current technology. We show that perturbations due to an IBH in orbit around the MBH can produce a shift in the apoapsis of S2 that is as large or even larger than the GR shift. An IBH will also induce changes in the plane of S2's orbit at a level as large as one degree per period. We apply observational orbital fitting techniques to simulations of the S-cluster in the presence of an IBH and find that an IBH more massive than about 1000 solar masses at the distance of the S-stars will be detectable at the next periapse passage of S2, which will occur in 2018.

10 pages, 11 figures, MNRAS accepted

References in corpus (7)

• Trigonometric Parallaxes of Massive Star Forming Regions: VI. Galactic Structure, Fundamental Parameters and Non-Circular Motions
• The Two Young Star Disks in the Central Parsec of the Galaxy: Properties, Dynamics and Formation
• Implementing Few-Body Algorithmic Regularization with Post-Newtonian Terms
• Gas flow models in the Milky Way embedded bars
• Dynamical evolution of the young stars in the Galactic center: N-body simulations of the S-stars
• On the nature of the fast moving star S2 in the Galactic Center
• Explaining the Orbits of the Galactic Center S-Stars

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