Black holes were stripped when two galaxies collided

Astronomers discovered that a supermassive black hole escaped from the galaxy, leaving behind all the stars that once turned around it.

A group of astronomers using telescope Very Long Baseline Array (VLBA) in Hawaii, the US discovered the black hole B3 1715 + 425 inside a tiny galaxy running away from the larger galaxy named ZwCl 8193 , according to IFL Science. The discovery was published on November 2 in the Astrophysical Journal. The small galaxy has lost most of its gas and dust, leaving a nearly naked black hole moving at speeds above 2,000 km / sec.

The illustration of a black hole is almost naked due to stars.(Photo: Bill Saxton).

"We are looking for pairs of supermassive black holes that revolve around each other to find this black hole flees the larger galaxy, trailing a long trail of dust behind us. We have never caught the same thing before , " James Condon, scientist at the National Radio Observatory, the lead author of the study, said.

The system of galaxies and black holes that Condon's team tracks is in the galaxy cluster two billion light-years from the Milky Way. The researchers chose it due to unusual optical suffering. Analysis shows that this is a fast moving galaxy with a diameter of 3,000 light-years. A medium-sized galaxy like the Milky Way has a diameter of 100,000 light-years.

Based on mass and how the black hole moves, the team thinks that the highest possibility is that a normal galaxy collides with ZwCl 8193, being sucked in most of the dust, stars and gas as it passes near the galactic core giant

B3 1715 + 425 and the disappearing galaxy are the last traces of the collision. However, the black hole has not lost all its surrounding stars, so the researchers call it a nearly naked black hole."In about a billion years, it can become invisible," Condon said.

The findings indicate that the supermassive black holes are wandering the universe . The team thinks that more observations need to be made to understand the uniqueness of B3 1715 + 425.