New research reveals hundreds of undiscovered black holes

University of Surrey

NASA/ESA Hubble Space Telescope Observation of the central region of the Galactic globular cluster NGC 6101: compared to the majority of Galactic globular clusters, NGC 6101 shows a less concentrated distribution of observable stars. Image credit: NASA.
NASA/ESA Hubble Space Telescope Observation of the central region of the Galactic globular cluster NGC 6101: compared to the majority of Galactic globular clusters, NGC 6101 shows a less concentrated distribution of observable stars. Image credit: NASA.
New research by the University of Surrey just published in the journal Monthly Notices of the Royal Astronomical Society has shone light on a globular cluster of stars that could host several hundred black holes, a phenomenon that until recently was thought impossible.

Globular clusters are spherical collections of stars which orbit around a galactic centre such as our Milky-way galaxy. Using advanced computer simulations, the team at the University of Surrey were able to see the un-see-able by mapping a globular cluster known as NGC 6101, from which the existence of black holes within the system was deduced. These black holes are a few times larger than the Sun, and form in the gravitational collapse of massive stars at the end of their lives. It was previously thought that these black holes would almost all be expelled from their parent cluster due to the effects of supernova explosion, during the death of a star.

“Due to their nature, black holes are impossible to see with a telescope, because no photons can escape,” explained lead author Miklos Peuten of the University of Surrey. “In order to find them, we look for their gravitational effect on their surroundings. Using observations and simulations we are able to spot the distinctive clues to their whereabouts and therefore effectively ‘see’ the un-seeable.”

This picture is from the computer simulation of the cluster NGC 6101 with all of its black holes removed from the cluster at its current age: the centre of the star cluster looks more concentrated than observed in NASA/ESA Hubble Space Telescope image of that cluster. Apparently, this simulation is missing something and therefore cannot recreate the observed properties of the cluster. Image credit: University of Surrey.
This picture is from the computer simulation of the cluster NGC 6101 with all of its black holes removed from the cluster at its current age: the centre of the star cluster looks more concentrated than observed in NASA/ESA Hubble Space Telescope image of that cluster. Apparently, this simulation is missing something and therefore cannot recreate the observed properties of the cluster. Image credit: University of Surrey.
It is only as recently as 2013 that astrophysicists found individual black holes in globular clusters via rare phenomena in which a companion star donates material to the black hole. This work, which was supported by the European Research Council (ERC), has shown that in NGC 6101 there could be several hundred black holes, overturning old theories as to how black holes form.

Co-author Professor Mark Gieles, University of Surrey continued, “Our work is intended to help answer fundamental questions related to dynamics of stars and black holes, and the recently observed gravitational waves. These are emitted when two black holes merge, and if our interpretation is right, the cores of some globular clusters may be where black hole mergers take place.”

The researchers chose to map this particular ancient globular cluster due to its recently found distinctive makeup, which suggested that it could be different to other clusters. Compared to other globular clusters NGC 6101 appears dynamically young in contrast to the ages of the individual stars. Also the cluster appears inflated, with the core being under-populated by observable stars.

This is a picture from the computer simulation of the cluster NGC 6101 at its current age, this time with all its black holes kept in the cluster at their creation time: the cluster from the simulation shows the same puffed up distribution of stars as can be found in the NASA/ESA Hubble Space Telescope image. The black holes, being the heaviest component in the cluster, sink over the course of the clusters evolution into the cluster centre, thereby pushing out every observable star into the clusters outer regions. Image credit: University of Surrey.
This is a picture from the computer simulation of the cluster NGC 6101 at its current age, this time with all its black holes kept in the cluster at their creation time: the cluster from the simulation shows the same puffed up distribution of stars as can be found in the NASA/ESA Hubble Space Telescope image. The black holes, being the heaviest component in the cluster, sink over the course of the clusters evolution into the cluster centre, thereby pushing out every observable star into the clusters outer regions. Image credit: University of Surrey.
Using computer simulation, the team recreated every individual star and black hole in the cluster and their behaviour. Over the whole lifetime of thirteen billion years the simulation demonstrated how NGC 6101 has evolved. It was possible to see the effects of large numbers of black holes on the visible stars, and to reproduce what was observed for NGC 6101. From this, the researchers showed that the unexplainable dynamical apparent youth is an effect of the large black hole population.

“This research is exciting as we were able to theoretically observe the spectacle of an entire population of black holes using computer simulations. The results show that globular clusters like NGC 6101, which were always considered boring are in fact the most interesting ones, possibly each harbouring hundreds of black holes. This will help us to find more black holes in other globular clusters in the universe,” concluded Peuten.