General, Research, Technology

The fastest star leaves the Milky Way at a speed of 1.7 thousand km / s

The sun is constantly moving in space. Its speed is 720 thousand km / h, but this is nonsense in comparison with other stars. Recently, astronomers have discovered a star called S5-HVS1, which moves at a speed of 6 million km / h. This star is able to leave our galaxy, and at the same time receive the title of the fastest star of the Milky Way. The fact is that some stars move very quickly, so they are called hyper-fast. To date, astronomers know very few of these objects. However, the researchers defined the concept of "hyper speed" - usually it is a speed that exceeds 500 km / s. Moving so fast, the star is able to avoid the gravitational attraction of our galaxy and can leave the Milky Way. The work of scientists is published in the journal Monthly Notices of the Royal Astronomical Society.

A black hole in the center of the Milky Way galaxy separated two stars

The fastest star in the galaxy

It's no secret that all objects in space are inconstant movement. Some stars, galaxies and other bodies move faster, and some slower. However, astronomers now know the fastest star, at least in our galaxy. Star S5-HVS1 moves at a speed of more than 1700 km / s, which is much higher than the speed of its predecessor - the white dwarf US708, which moves at a speed of 1200 km / s. But where do these stars come from and why are they moving so fast?

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The most common is the hypothesis ofthat when the binary system of stars is too close to a black hole, one of them is captured by a black hole, and the other is ejected at a very high speed. This hypothesis is known as the Hills mechanism. Recall that the binary system of stars is a common space objects. Systems of two stars, which are gravitationally connected to each other, rotate in closed orbits around a common center of mass.

The binary system of stars looks like this

However, the case of S5-HVS1 is unique. The research team was able to trace the entire path of the star and determine which black hole caused the separation of the two stars and the enormous speed of the S5-HVS1. It turns out that the culprit of what happened was the notorious black hole Sagittarius A * - a supermassive black hole in the center of the Milky Way.

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Lead author told The GuardianSergey Koposov’s research, this is a very exciting discovery, since scientists have long suspected that stars can throw black holes at very high speeds. However, to this day, astronomers have not associated the ejection of stars with black holes in the center of galaxies.

Researchers believe supermassive blackSagittarius A * hole threw a star about five million years ago. At this time, on our planet, the ancestors of humanity only learned to walk on two legs. The fastest star in the Milky Way is located in the constellation Crane. This discovery helps expand our knowledge of hyper speed stars. The results of other studies indicate that thanks to such stars, researchers will be able to detect unknown black holes in the spiral arms of the galaxy. The fact is that many of these “escaping” stars can actually be guests of our humble galaxy.