Huge black holes might have merging baby black holes around them – Astronomy Magazine

The researchers created simulations to show that this was possible and described their results in the journal Physical Review Letters.

On July 29, 2017, gravitational wave detectors spotted the heaviest black hole merger yet, dubbed GW170729. One of the black holes in the merger was likely more than 50 times the mass of the Sun. Black holes that are created when a dying star collapses shouldnt be this big, so astronomers think something else was probably at play. Maybe that black hole was the result of a previous merger itself.

One place where a black hole might swallow multiple other singularities is in an environment thats dense with stars. Globular star clusters, for example, pack lots of stars and the black holes they sometimes form into a relatively tight space. There, a black hole might meet and combine with other black holes multiple times.

The new paper describes another kind of environment where black holes might merge more than once. Disks of material that swirl around supermassive black holes, the papers authors propose, might shepherd smaller black holes within them into similar tracks. As in the star clusters, there black holes might eventually converge on multiple occasions.

The researchers created simulations of these orbiting black holes and found that a series of mergers would create black holes that are 50 or more solar masses, like the more massive black hole in the merger GW170729.

The mergers from black holes orbiting a supermassive black hole would probably have rotation characteristics distinct from other merger scenarios. As gravitational wave detectors spot more black hole mergers, their data might be a way to tell whether these oddly large black holes are really createdthis way.

So far, scientists have identified 10 confirmed mergers of black hole pairs. But there have been many more gravitational wave detections that are black hole merger candidates, which scientists are working to confirm.

Whatever questions were asking, were going to have a much, much better handle on answering them within a very short time period, said Imre Bartos, an astronomer at the University of Florida, Gainesville, and one of the authors of the new paper. Its super exciting.

View original post here:

Huge black holes might have merging baby black holes around them - Astronomy Magazine