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Based on these data, they constructed the distribution of velocities and distances for 7 million stars of the Milky Way.
"Rather than running away from the galactic center, most of the high-speed stars we've seen seem to be heading towards him," says Tommaso Marchetti, who used a network of artificial neurons, software created to replicate how our brain works. in order to help Gaia catch the fast stars. Or they could have their origin in a galaxy even further.
In December 2013, the European Space Agency (ESA) launched the Gaia mission.
The Milky Way contains about one hundred billion stars. The study was led by Tommaso Marchetti, doctoral candidate of the Leiden Observatory, and included Elena Rossi (Associate Professor in Leiden) and Anthony Brown, chairman of the Gaia Data Processing and Analysis Executive. (CAPD).
The Milky Way is apparently a favorite place for immigrant stars from other galaxies.
"Of the seven million Gaia stars with full 3D speed measurements, we have found twenty that could travel fast enough to eventually escape from the Milky Way."They move at different speeds depending on their location in a galaxy and their movement could provide essential information about the history of a particular galaxy.If this assumption is correct, if you study them, researchers will be able to to describe the mechanisms of star formation in other galaxies, and to determine if supermassive black holes, as they tend to give the luminaries such a speed.If this is true, these stars will wear them. Footprint of their original site Exceptionally, 13 stars appeared to be extragalactic.
The co-author of the study, Elena Maria Rossi, also from the University of Leiden, said: "Stars can be accelerated at high speeds when they interact with a supermassive black hole. "The presence of these stars could therefore be the sign of such black holes in neighboring galaxies". How could we? Data for so many stars would be (are) massive; collecting, storing and analyzing data requires modern space and computer technologies.
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The research team recognizes that there is another possibility. Therefore, it is possible that old interactions between the Milky Way and one of its dwarf galaxies have repelled some halo stars, although the study indicates that this scenario would imply that the Milky Way is more massive than we think now. However, if they turn out to be filled with heavy elements, many hypervelocity stars may have extragalactic origins. The interaction a distant part of the Milky Way with flying through the galaxy caused the collision because of the strong attraction.
ESA Gaia Mission is proving to be an excellent provider of fascinating data.
For 7 million brightest stars in the series, Gaia managed to obtain 3D movements by also measuring the speed at which the stars moved towards or away from the Earth. Most are located in the galactic disk with a dense bulge at its center, while the remaining stars are distributed in a wider spherical halo.
Only a small number of hypervelocity stars have ever been discovered, and Gaia's second data release offers a unique opportunity to research others.
These latest results demonstrate once again how much Gaia observatory has been in his mission.
Fortunately, Gaia should publish at least two other datasets in the 2020s.
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