Credit: 2015 Kentaro Nagamine, Osaka University
Caption: Simulation of a network of dark matter filaments in a high-density region of the early Universe. Each dense bright spot is a dark matter halo into which gas collapses to form large galaxies and supermassive black holes.

Simulating supermassive black holes

Cutting-edge simulations explain how supermassive black holes and galaxies formed from collapsing gas clouds in the early Universe

Near the edge of the visible Universe are some of the brightest objects ever observed, known as quasars, which are believed to contain supermassive black holes of more than a billion times the mass of our Sun. Simulations by Kentaro Nagamine at Osaka University’s Department of Earth and Space Science, Isaac Shlosman at the University of Kentucky and co-workers have revealed for the first time exactly how these black holes formed 700 million years after the Big Bang.

“The early Universe was a dense, hot and uniform plasma,” explains Nagamine. “As it cooled, fluctuations in the mass distribution formed seeds around which matter could gather due to gravity.” These are the origins of the first stars. Similar processes might have later seeded the growth of bigger structures such as supermassive black holes.

Until recently, many researchers thought supermassive black holes were seeded by the collapse of some of the first stars. But modeling work by several groups has suggested that this process would only lead to small black holes. Nagamine and co-workers simulated[1] a different situation, in which supermassive black holes are seeded by clouds of gas falling into potential wells created by dark matter — the invisible matter that astronomers believe makes up 85% of the mass of the Universe.

Simulating the dynamics of huge gas clouds is extremely complex, so the team had to use some numerical tricks called ‘sink particles’ to simplify the problem.

“Although we have access to extremely powerful supercomputers at Osaka University’s Cybermedia Center and the National Astronomical Observatory of Japan, we can’t simulate every single gas particle,” explains Nagamine. “Instead, we model small spatial scales using sink particles, which grow as the surrounding gas evolves. This allows us to simulate much longer timescales than was previously possible.”

The researchers found that most seed particles in their simulations did not grow very much, except for one central seed, which grew rapidly to more than 2 million Sun-masses in just 2 million years, representing a feasible path toward a supermassive black hole. Moreover, as the gas spun and collapsed around the central seed it formed two misaligned accretion discs, which have never been observed before.

In other recent work, Nagamine and co-workers described the growth of massive galaxies that formed around the same time as supermassive black holes [2]. “We like to push the frontier of how far back in time we can see,” says Nagamine. The researchers hope their simulations will be validated by real data when NASA’s James Webb Space Telescope, due to be launched in 2018, observes distant sources where direct gas collapse is happening.

Professor Kentaro Nagamine
Theoretical Astrophysics Group
Department of Earth and Space Science
Graduate School of Science
Osaka University
http://vega.ess.sci.osaka-u.ac.jp/~kn/
kn@vega.ess.sci.osaka-u.ac.jp

Reference:
1. Shlosman, I., Choi, J.-H., Begelman, M.C. & Nagamine, K. Supermassive black hole seed formation at high redshifts: Long-term evolution of the direct collapse. Monthly Notices of the Royal Astronomical Society 456, 500–511 (2016).
DOI: http://dx.doi.org/10.1093/mnras/stv2700
2. Yajima, H., Shlosman, I., Romano-Díaz, E. & Nagamine, K. Observational properties of simulated galaxies in overdense and average regions at redshifts z≈6-12. Monthly Notices of the Royal Astronomical Society 451, 418–432 (2015).
DOI: http://dx.doi.org/10.1093/mnras/stv974

This research project was supported by the Osaka University International Joint Research Promotion Program, which aims to further enhance research quality and promote globalization at Osaka University through advanced research with overseas collaborators. Professor Nagamine jointly conducted this research with the following researchers: Professor Isaac Shlosman, University of Kentucky, United States