Scientists announced on Wednesday that they had discovered a black hole, which is the oldest black hole discovered so far. According to the current understanding of cosmic monsters, it shouldn’t even exist because it’s so dense that it can’t escape its gravity even without light.
GW190521 was born between two other black holes. Its weight is 142 times the mass of the sun. It is the first “intermediate mass” black hole ever observed. This is a study by two consortiums of 1,500 scientists. Reported in.
Stavros Katsanevas, an astrophysicist at the European Gravitational Observatory, said at an online press conference: “This event opens the door to the formation of black holes in the movement of the universe.”
“This is a whole new world.”
When a dying star collapses, so-called constant star black holes are formed, usually three to ten solar masses in size.
Supermassive black holes found in the centers of most galaxies, including the Milky Way, range from millions to billions of solar masses.
So far, no black hole with a mass 100 to 1,000 times the mass of the sun has been discovered.
Michaela, an astrophysicist at the University of Padua and a member of the European Virgo Cooperation Organization, said: “This is the first evidence that a black hole appears in this mass range.”
“This may cause a paradigm shift in the astrophysics of black holes.”
She added that these findings support the idea that a supermassive black hole can be formed through repeated mergers of these medium-sized bodies.
The gravitational waves actually observed by scientists were produced 7 billion years ago, when GW190521 was formed by the collision of two black holes with masses of 85 and 65, respectively, with smaller solar masses.
When they hit together, they released eight solar masses of energy, which is one of the most powerful events in the universe since the Big Bang
Gravitational waves were first measured in September 2015, and two years later, the lead researcher won the Nobel Prize in physics.
Albert Einstein predicted gravitational waves in his general theory of relativity, which states that gravitational waves travel through the universe at the speed of light.
Challenges to current models
GW190521 was detected by three interferometers on May 21, 2019. When gravity waves pass through the earth, they can measure changes thousands of times smaller than the atomic nucleus.
According to current knowledge, the gravitational collapse of a star cannot form a black hole in the range of 60 to 120 solar masses, because at this size, the star will be completely exploded due to the explosion of the supernova accompanying the collapse.
However, the two black holes that caused GW190521 are both within range.
Mapelli said: “This incident is a challenge to the current black hole formation model.”
This also implies that how much is still unknown.
Astronomer Karan Jani said: “This discovery confirms that we still can’t see the vast universe,” the astrophysicist of Nobel Prize winner LIGO’s gravitational wave experiment.
“We have very limited understanding of the theory and observations of this elusive intermediate black hole.”
But the fact that can be detected is extraordinary in itself.
Jani added: “We were able to discover a black hole several hundred kilometers wide from the middle of the entire universe. This is one of the most shocking discoveries of this discovery.”
Two studies were published in “Physics Review Letters” and “Astrophysical Journal Letters”.
The LIGO (Laser Interferometer Gravity Wave Observatory) consortium is led by scientists from the Massachusetts Institute of Technology and California Institute of Technology, and the Virgo collaboration includes more than 500 scientists from Europe.
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