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Astronomers: milky Way attracts the “wrong” star

Астрономы: Млечный Путь притягивает «чужие» звездыThe milky Way is in the intergalactic void is not alone, but in the company of a large retinue of dwarf galaxies.

Astronomers discovered that many stars on the outskirts of our Galaxy formed not within its limits, and was “stolen” it from a neighboring dwarf galaxies, periodically converging with the Milky Way, according to a paper published in the Astrophysical Journal.

“These lights are in a kind of “star streams” which stretches for about a million light years and are far beyond our galaxy. Today we see only small streams such stars, however, in the future, as we predict, we will find rivers of these “foreign” bodies,” said Marion Dirich (Marion Dierickx) from Harvard University (USA).

Star river

The milky Way is in the intergalactic void is not alone, but in the company of a large retinue of dwarf galaxies, most of which we cannot see because of their extreme dullness. Today scientists believe, many of these dwarfs periodically moving closer to our Galaxy, the final “traces” which are the so-called star streams.

They look like a kind of “tape” of stars, not related to each other by gravity, orbiting the center of the milky Way over and under the disk, where the Earth, Sun and nearly all other stars. Stellar streams as today the astronomers believe, are the remnants of globular clusters or dwarf galaxies, once torn to pieces and absorbed the Milky Way in the distant past.

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During these apocalyptic events, as found by astronomers five years ago, during the observation of the so-called “ring of the unicorn”, one of the most visible stellar streams of the milky Way “steals” almost all the dark matter have torn them galaxies. As a result, they fall apart and turn into those tapes that we can see in the night sky above the disk of the Galaxy.

Dirich and her colleague Abraham Loeb (Abraham Loeb) from the Harvard-Smithsonian astrophysical Observatory in Cambridge (USA) has found one of the largest and most distant ribbons of this type, watching the dwarf galaxy DEG in the constellation Sagittarius, which collision with the milky way causes it to break down into four distinct “tail.”

The light of foreign stars

They accidentally made this discovery, figuratively speaking, the tip of the pen – initially, Loeb and Dirich not tried to look for “alien” stars on the outskirts of the milky Way, and counted how galaxy DEG moved in the last 8 billion years.

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They have done the calculations have shown that this time is not passed in vain for the dwarf galaxy as a result of the convergence and the gravitational interactions with the Milky Way, she lost about a third of their stars and about 90% dark matter, with the result that she began to fall apart.

Part of her stars, because the actual collapse of the galaxy, “lost” in space and were captured by the gravity of the milky Way. Due to this, 5 of 11 most distant stars of the galaxy, remote from Earth for about 300 thousand light-years, in fact, born in DEG and not in our “star metropolis”. This is evidenced by the unusual speed of these stars around the center of the milky Way and where they are located. The other seven stars, according to astronomers, was “stolen” by our Galaxy from another dwarf galaxy.

According to Loeb, these stars actually a lot more, but finding them will require the launch of more powerful telescopes, such construction overview the LSST telescope that can detect even the dim light.

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