Black hole binaries and merger between supermassive black holes
Galaxies and black holes are like bread and butter. They live side by side. While pointing towards galaxies is easy, finding black holes is difficult indeed.
It is universally accepted fact that massive galaxies have huge black holes at their center. We also know that galaxies tend to merge occasionally to form even bigger galaxies.
So what happens to massive black holes when these galaxies merge to make even a bigger galaxy?
A latest study talks about pulsing quasar and claim that pulsing quasar supports the theory of black hole binaries. The new study has been conducted by researchers associated with the University of Maryland.
Suvi Gezari, assistant professor of astronomy at the University of Marylandwhile talking about the findings says, â€œWe believe we have observed two supermassive black holes in closer proximity than ever beforeâ€¦This pair of black holes may be so close together that they are emitting gravitational waves, which were predicted by Einsteinâ€™s theory of general relativity.â€
Researchers are of the opinion that as black holes suck in matter, they create some of the brightest objects ever found in the universe â€“ quasars. If there are a pair of black holes orbiting as a binary, they absorb matter in cycles. Researchers theorize these cycles would cause the quasar to pulse brighter and then dimming.
University of Maryland astronomers were helped by Panoramic Survey Telescope and Rapid Response System (Pan-STARRS1) Medium Deep Survey to find pulsing quasars. Researchers also came across PSO J334.2028+01.4075 in the course of their study. This quasar was part of a very large black hole of nearly 10 billion solar masses. What caught the researchersâ€™ attention was it emitted a periodic optical signal every 542 days.
One of the authors of the study Tingting Liu says, â€œThe discovery of a compact binary candidate supermassive black hole system like PSO J334.2028+01.4075, which appears to be at such close orbital separation, adds to our limited knowledge of the end stages of the merger between supermassive black holesâ€.