Scientists have reported that they have discovered gravitational waves of 10 black holes mergers to date, but they still try to explain the origins of these mergers , The largest concentration ever identified appears to defy earlier models as it has a higher spin and bulk than the range it considers possible. A group of researchers, including the assistant to the Rochester Institute of Technology, Professor Richard O & # 39; Shaughnessy, have created simulations that could explain how the merger came about.
In a new paper published in Physical Review Letters (19459010), published November 1, 2019, researchers suggest that such large fusions could occur just outside supermassive black holes in the center of active galactic nuclei. Gas, stars, dust and black holes are trapped in a region that surrounds supermassive black holes, known as the accretion disk. The researchers speculate that black holes, as they revolve in the accretion disk, eventually collide and unite into a larger black hole that continues to devour smaller black holes and what O & # 39; Shaughnessy calls "Pac-Man-like." , getting bigger. Behavior.
"This is a very tempting prospect for those of us who work in this field," said O & # 39; Shaughnessy, a member of the RIT Center for Computer-Aided Relativity and Gravitation (CCRG). "It provides a natural way to explain high mass, high spin binary black hole fusions and create binaries in parts of the parameter space that the other models can not fill. There is no way to get out certain types of black holes from these other formation channels.
As the collaboration of LIGO and Virgo continues to rely on gravitational waves, O & # 39; Shaughnessy and his colleagues hope to find signatures of large, rotating black holes that could help their models to confirm. If their assumptions are correct, we can better understand how the cosmic web of galaxies is composed.
"This could be a unique opportunity to study physics around these supermassive black holes in ways that could not be studied in any other way," said O & # 39; Shaughnessy. "It provides a unique insight into the growth of galaxy centers, which of course is important to understanding how galaxies grow as a whole, which explains most of the structure in the universe."
Hierarchical Blackhole Fusion in Active Galactic Nuclei
Y. Yang, I. Bartos, V. Gayathri, KES Ford, Z. Haiman, S. Klimenko, B. Kocsis, S. Márka, Z Márka, B. McKernan and R. O. Shaughnessy
Phys. Rev. Lett. 123, 181101 – Released November 1, 2019
RIT's CCRG consists of a large and active group of 18 faculties, students, and postdoctoral researchers involved in the LIGO Scientific Collaboration.