A medium-mass black hole was discovered for the first time in history. How did such a black hole form?

According to the website of the American Laser Interference Gravitational Wave Observatory reported on the 2nd, the observatory is located in Italy? Virgo? (Virgo) Gravitational Wave Observatory, together, detected a black hole whose mass is 0/42 times that of the sun/kloc-.This is the first time that scientists have detected this? Medium quality? Black holes are also the most massive black holes detected by gravitational waves. What is the most massive gravitational wave source so far? Be caught red-handed.

Black holes are celestial bodies with small volume and large mass. According to different masses, they are generally divided into stellar black holes, medium-mass black holes and supermassive black holes. So far, scientists have discovered many stellar black holes and supermassive black holes. Medium-mass black holes are in between, and their mass is 100 to 1000 times that of the sun. So far, scientists have not found any evidence to prove their existence. ?

The researchers pointed out that the latest findings also raised a series of questions. They explained that the observed black holes can be roughly divided into two categories: stellar-mass black holes and supermassive black holes. The former is several times to dozens of times the mass of the sun and is considered to be formed after the death of a massive star; The mass of the latter is about several hundred thousand to several billion times that of the sun. The 142 times solar mass black hole produced by this gravitational wave event is located between the stellar mass and the supermassive black hole, which belongs to the medium mass range, and it is also the first time that scientists have detected such a black hole.

In addition, the size of the merged two black holes is also very special. They are so heavy that scientists suspect that one or two of them may not be formed by collapsing stars like most stellar mass black holes. Because the unstable phenomenon shows that collapsed star should not form a mass of about 65 times? 120 times the mass of the sun, this range is called? Vacancies with unstable quality? .

However, a black hole with 85 times the mass of the sun in the GW 19052 1 event is the first black hole with a mass falling within this range. In this regard,

The researchers put forward the possibility of hierarchical merger: the merged two black holes were previously merged from smaller black holes.