Astronomers found an ancient galaxy with the Hall of Dark Matter


Just something visible in tukana.

Just something visible in tukana.
The image: ESA / Hubble and NASA ()fair use)

some 163,000 light-Years from milky way A much smaller, much more ancient galaxy: Tussana II, named after the constellation resembling the tropical bird in which it sits. Seated at the periphery of the gravitational pull of our galaxy, Tussana II offers researchers the opportunity to understand the structure of the earliest galactic structures in the universe.

Now, there is a team of astronomers Evidence of a broad dark matter halo was found around the galaxy. His research was Posted on Today in the journal Nature Astronomy.

“We know [dark matter] This is because for galaxies to be bound, it has to be more the case than what we see from Starlight, ”said Anirudh Chitty, an astronomer at the Massachusetts Institute of Technology.In a phone call. “This leads to the hypothesis of existing dark matter as a component that holds galaxies together; Without it, galaxies as we know them, or at least stuff on their outskirts, would simply fall apart. “

Tucana dwarf galaxy, imaged by the Hubble Space Telescope.

Tucana dwarf galaxy, imaged by the Hubble Space Telescope.
The image: Hubble ()fair use)

Hello a dark matter is a field of gravity Matter bound in space. (Milky Way black matter halo Spread far The Pinwheel that forms the visible substance of our galaxy). The team found that Tusana II’s gravity range is between three and Five times more than previously thought, pretend Even some of the oldest galaxies will have dark matter manifestations.

Tucana II is the most chemically primitive galaxy we currently know, which means that some of its stars have very little metal (The heavier elements of the universe were produced later). The team realized that Tussana II had a halo of dark matter when stars were observed in the area of ​​the sky that the stars were moving in the atmosphere.

“If you just look at the area of ​​the sky where the galaxy exists, you don’t really see a clustering of stars or an overdose,” Chitty, Who is it The lead author of a recent letter, Said. “It is only when you look at their velocities and realize that it is moving a group of stars at the same velocity that you realize that there is a galaxy that exists there.”

As the study’s co-author Anna Freebell, also an MIT astronomer, put it in a university press release, the tumult of Tucana II’s movement resembles an “underwater bath drain”. Hypnotically, some of the galaxy’s peripheral stars are older than the stars closer to the galaxy center. The team hypothesizes that the collision II may be the result of previous galactic mergers, a cosmic conflict that appears to consume one primitive galaxy by another, resulting in stars of different origins in the same galaxy.

Whether or not that theory of Genesis II is true, a similar bump is definitely in its future.. Since it is under the gravitational realm of the much larger Milky Way, eventually, a relatively small galaxy will be swallowed up by us.

While astronomers know how Dark Matter Hallows are shown, they still do not know what Dark Matter really is. In addition to finding its location around galaxies, researchers are also looking into the identity of Dark Matter Mysterious signs from neutron stars and as Small, theoretical black holes.

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