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Hurricane of dark matter | Astronomy.com



In our corner of the Milky Way, a "whirlwind of dark matter" is blowing. Exactly at this moment it goes over the earth. And this fast-moving stream could reveal important details about dark matter, a new study reveals.

The dark matter wanders in the so-called S1 current. Scientists believe that streams like these are the cosmic debris left over when small galaxies are too close to the Milky Way. Our gravitational forces disrupt the smaller galaxy leaving a traveling, elliptical stream of stars, dark matter and other debris.

Hurricane of Dark Matter

Dark matter is an elusive material that scientists believe, if the standard model is correct, exists in large quantities throughout space. Scientists still do not know what dark matter really is ̵

1; there are a number of leading theories, but nobody knows for sure. However, it is predicted that the S1 stream will blow past dark matter at about 500 km / s (500 km / s) at this time, and this could provide an opportunity for detection.

Galactic streams

Dozens of such streams were found in the Milky Way. And like the galaxies they are deprived of, these streams typically consist of stars and dark matter, all traveling at the same speed. "There are tons of currents all over the galaxy, some of them are really huge and you can see them in the sky," said Ciaran O'Hare of the University of Zaragoza in Spain.

The European Space Agency The billion-star investigation with the Gaia probe extends far into our galaxy to discover and observe stars. Gaia chose the S1 current because its approximately 30,000 stars have a different chemical composition than those native to our galaxy. And they travel on a similar elliptical path.

And although in our galaxy over 30 such streams are known, S1 still astonished astronomers, as our solar system is actually in the current. And our paths will cross millions of years. Well, this will not affect our life or our planet in any way – there is still only one star (the Sun) in our solar system.

But O & Hare and his colleagues have calculated the influence of S1 current in our part of the galaxy and predicted possible dark matter signatures that could help and support the search for the elusive substance.

"What we want to do is to add the current as part of our main prediction for the galaxy to types of signals that should emerge in an experiment with dark matter," said O & Hare. According to one statement, current detectors looking for weakly interacting massive particles (WIMPs) (a popular notion of dark matter) are unlikely to see S1, but future technology.

Their study was published in Journal Physical Review D.


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