Mapping the Galactic centre's dark cluster via Resonant Relaxation

Abstract

Supermassive black holes in the centre of galaxies dominate the gravitational potential of their surrounding stellar clusters. In these dense environments, stars follow nearly Keplerian orbits, which get slowly distorted as a result of the potential fluctuations generated by the stellar cluster itself as a whole. In particular, stars undergo a rapid relaxation of their eccentricities through both resonant and non-resonant processes. An efficient implementation of the resonant diffusion coefficients allows for detailed and systematic explorations of the parameter space describing the properties of the stellar cluster. In conjunction with recent observations of the S-cluster orbiting SgrA*, this framework can be used to jointly constrain the distribution of the unresolved, old, background stellar cluster and the characteristics of a putative dark cluster. Specifically, we show how this can be used to estimate the typical mass and cuspide exponent of intermediate-mass black holes consistent with the relaxed state of the distribution of eccentricities in the observed S-cluster. This should prove useful in constraining super massive black hole formation scenarios.

arXiv comment13 pages, 10 figures, submitted to MNRAS

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Cited by in corpus (10)

• The dark mass signature in the orbit of S2
• Observation of S4716 -- a Star with a 4 yr Orbit around Sgr A*
• Where intermediate-mass black holes could hide in the Galactic Centre: A full parameter study with the S2 orbit
• Constraints on the Galactic Centre environment from \textit{Gaia} hypervelocity stars III: Insights on a possible companion to Sgr A*
• Orbital alignment and mass segregation in galactic nuclei via vector resonant relaxation
• Constraints on the origins of hypervelocity stars: velocity distribution, mergers and star-formation history
• Forming Young and Hypervelocity Stars in the Galactic Centre via Tidal Disruption of a Molecular Cloud
• The S stars' zone of avoidance in the Galactic center
• Dark Matter reconstruction from stellar orbits in the Galactic Centre
• On the Missing Red Giants near the Galactic Center