An Overabundance of Black Hole X-Ray Binaries in the Galactic Center from Tidal Captures

TL;DR

This study models the formation of black hole and neutron star X-ray binaries in the Galactic Center via tidal capture, predicting a population consistent with recent observations and estimating rates of related dynamical processes.

Contribution

It introduces a Fokker-Planck based model of the nuclear star cluster to predict XRB populations formed through tidal capture, aligning with observed data.

Findings

Predicted 60-200 BH-XRBs formed by tidal capture in the Galactic Center.

Estimated lower number of tidal capture NS-XRBs.

Predicted star tidal disruption rate of ~0.0001 per year.

Abstract

A large population of X-ray binaries (XRBs) was recently discovered within the central parsec of the Galaxy by Hailey et al. While the presence of compact objects on this scale due to radial mass segregation is, in itself, unsurprising, the fraction of binaries would naively be expected to be small because of how easily primordial binaries are dissociated in the dynamically hot environment of the nuclear star cluster (NSC). We propose that the formation of XRBs in the central parsec is dominated by the tidal capture of stars by black holes (BHs) and neutron stars (NSs). We model the time-dependent radial density profiles of stars and compact objects in the NSC with a Fokker-Planck approach, using the present-day stellar population and rate of in situ massive star (and thus compact object) formation as observational constraints. Of the ~10,000-40,000 BHs that accumulate in the central parsec over the age of the Galaxy, we predict that ~60 - 200 currently exist as BH-XRBs formed from tidal capture, consistent with the population seen by Hailey et al. A somewhat lower number of tidal capture NS-XRBs is also predicted. We also use our observationally calibrated models for the NSC to predict rates of other exotic dynamical processes, such as the tidal disruption of stars by the central supermassive black hole (~0.0001 per year at z=0).