A team of international astronomers discovered an inactive, stellar-mass blackhole outside the Milky Way. This discovery was made by observing large stars in the Large Magellanic Cloud satellite, which is part of our Galaxy.
“We spent over two years looking for binary star systems with a dormant dark hole. The VFTS 243 system was the most convincing candidate to be such an object. Julia Bodensteiner, a scientist at the European Southern Observatory (ESO), said that she was pleased to have discovered the VFTS 243 system.
The gravitational collapses of large stars can make stern-mass black hole detection difficult, even at a distance from Earth. Their existence is usually only discovered by astronomers if there is a luminary near them. These luminaries are made up of matter black holes that constantly drag on themselves. These star systems are very rare in galaxies, making it difficult to search for stellar mass black holes.
Bodensteiner and her coworkers have discovered an extragalactic star system that almost doesn’t pull the matter of its neighbour onto itself. They also found no visible signs of activity in X-ray frequencies. This discovery was made while studying large stars in the Large Magellanic Cloud.
This galaxy is home to the Tarantula Nebula. It is one of the most prolific star-forming areas in the vicinity of the Milky Way. Large stars are continually being created in this dust and gas cloud. Their mass is often tens to hundreds of times greater than the sun. These large luminaries quickly exhaust their hydrogen reserves and become black holes.
Scientists have been tracking thousands of stars in Tarantula Nebula since then, in an attempt to detect characteristic fluctuations in their speed and spectrum that could indicate the presence a large and invisible satellite. Scientists detected the fluctuations while observing VFTS 243 (a star with a mass approximately 25 times that of the Sun).
Astronomers discovered that this luminary revolves around an “sleeping” dark hole, whose mass must be at least nine times greater than the Sun’s. The star system VFTS 243’s components are at a very close distance to each other. This allows the star to complete a revolution around the black holes in only 11 days.
Astronomers believe that the absence of any visible evidence of a supernova blast in the VFTS 243 systems and the large mass indicate that the black hole was formed as a result the direct gravitational collapse a large star. This makes the black hole extremely interesting to study.