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Astronomers show signs of super massive black hole mergers

New research, published Wednesday, October 24, in the monthly monthly notices of the Royal Astronomical Society, has proven evidence of…

New research, published Wednesday, October 24, in the monthly monthly notices of the Royal Astronomical Society, has proven evidence of a large number of double super mass black holes, likely precursors for giant black hole merging events. This confirms the current understanding of cosmological evolution – that galaxies and their associated black holes melt over time, forming larger and larger galaxies and black holes.

Astronomers from the University of Hertfordshire, together with an international team of researchers, have watched radio charts with powerful sources of radiation and found signs that would usually be present when looking at black holes close to each other.

Before black holes melt, they form a binary black hole where the two black holes circle around each other. Gravitational wave telescopes have been able to prove the merger of smaller black holes since 201

5 by measuring the strong bursts of gravity waves emitted when binary black holes are joined, but current technologies can not be used to show the presence of super massive binary black holes.

Super massive black holes emit powerful rays. When super massive binary black holes create the beam that emerges from the core of a galaxy to periodically change its direction. Astronomers from the University of Hertfordshire studied the direction that these jets are emitted and deviations in these directions; They compared the direction of the jet with one of the radio blocks (which stores all the particles that ever went through the beam channels) to show that this method can be used to indicate the presence of super massive binary black holes.

Dr. Martin Krause, principal author and university astronomer at University of Hertfordshire, said: “We have studied jets under long-term relationships with computer simulations. In this first systematic comparison with high resolution radio charts of the most powerful radio sources, we were surprised to find signatures like were compatible with jet precession in three quarters of the sources. “

The most powerful rays associated with binary black holes can have important consequences for the formation of stars in galaxies; stars form from cold gas, jets heat this gas and thus suppress the formation of stars. A beam that always leads in the same direction only heats a limited amount of gas nearby.

Jets from binary black holes change, however, continuously. Therefore, they can heat much more gas, suppress the formation of stars much more efficiently, thus helping to keep the number of stars in galaxies within the observed limits.

Research Report: “How often are near super massive binary black holes in powerful sources?”, “MGH Krause, S. S. Shabala, M.J. Hardcastle et al., 2018, September 21, Monthly Announcements from the Royal Astronomical Society

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