A binary origin for the first isolated stellar-mass black hole detected with astrometric microlensing

TL;DR

This paper investigates the origins and properties of isolated stellar-mass black holes in the Milky Way, using astrometric microlensing data and population modeling to distinguish between binary and single star formation pathways.

Contribution

It provides a comprehensive model of black hole populations, predicts their mass and velocity distributions, and interprets recent microlensing events to infer black hole origins.

Findings

Most isolated BHs are of binary origin.

Most massive BHs (>15-20 Msun) are from single-star evolution.

Low-mass BH microlensing events help study binary evolution.

Abstract

The Milky Way is believed to host hundreds of millions of quiescent stellar-mass black holes (BHs). In the last decade, some of these objects have been potentially uncovered via gravitational microlensing events. All these detections resulted in a degeneracy between the velocity and the mass of the lens. This degeneracy has been lifted, for the first time, with the recent astrometric microlensing detection of OB110462. However, two independent studies reported very different lens mass for this event. Sahu et al. (2022) inferred a lens mass of 7.1 $\pm$ 1.3 Msun, consistent with a BH, while Lam et al. (2022) inferred 1.6-4.2 Msun, consistent with either a neutron star or a BH. Here, we study the landscape of isolated BHs formed in the field. In particular, we focus on the mass and center-of-mass speed of four sub-populations: isolated BHs from single-star origin, disrupted BHs of binary-star origin, main-sequence stars with a compact object companion, and double compact object mergers. Our model predicts that most ($\gtrsim$ 70%) isolated BHs in the Milky Way are of binary origin. However, non-interactions lead to most massive BHs ($\gtrsim$ 15-20 Msun) being predominantly of single origin. Under the assumption that OB110462 is a free-floating compact object we conclude that it is more likely to be a BH originally belonging to a binary system. Our results suggest that low-mass BH microlensing events can be useful to understand binary evolution of massive stars in the Milky Way, while high-mass BH lenses can be useful to probe single stellar evolution.