Astronomers figured out how many of the galaxies is our milky Way

Date:

2018-06-14 10:00:06

Views:

300

Rating:

1Like 0Dislike

Share:

Astronomers figured out how many of the galaxies is our milky Way

Analysis of the movement of several groups of stars in the halo of the milky Way by a team of astronomers from Groningen University (the Netherlands), suggests that our Galaxy in the past has experienced at least five small and one large-scale clash. The results of the study presented in the journal Astrophysical Journal Letters.

The Work is based on the second edition of the ESA satellite "Gaia", which provided the astronomical community with accurate information about the position and movement of millions of stars.

"Our goal is to understand how evolved the milky Way. The generally accepted mechanism of evolution of galaxies is mergers of smaller structures, which form larger homes. However, the main issue is the size of the primary components: merges many small or a few large galaxies? And since most stars in the halo of the milky Way are considered to be remnants of such events, my colleagues and I focused on these objects", – says Helmer Koppelman, the study's lead author.

Originally, scientists have identified information about the stars, located at a distance of 3000 light-years from the Sun, because they "Gaia" have gathered the most accurate information about position and movement. Then they filtered out the stars from the disk of the milky Way that are moving around the center of our Galaxy. As a result, astronomers remained a group of about 6000 of the stars residing in the halo.

By Calculating their trajectory, Helmer Koppelman and his team were able to identify groups of stars with a common origin.

"We found five small clusters which, in our opinion, are the remains of the five events of the merger. In addition, we were able to identify one large cluster with a retrograde motion relative to the disc of the milky Way. This indicates merging with a large galaxy in the past, which, we believe, changed the structure of our Galaxy. As a result, we can say that the milky Way was formed by one large and several small mergers," explains Helmer Koppelman.

Now, astronomers plan to explore the stars located at a distance of over 3000 light-years from the Sun to bring out more participants of the identified flows. Along with modeling the evolution of galaxies, the acquired data should provide exciting new hypotheses for the development of the milky Way.

Recommended

Found a giant bee, which was considered extinct for 40 years

Found a giant bee, which was considered extinct for 40 years

the entire history of the Earth have become extinct a lot of animals and insects, but sometimes people are able to detect extinct species even after many years. For example, in 1938, the sea has been found prehistoric fish coelacanth, which, accordin...

The answers to the greatest problems of science: how far we've come?

The answers to the greatest problems of science: how far we've come?

About the nature of the Universe itself, much is unknown. It is the curiosity inherent in the people, leading to the search for answers to these questions, and moves science forward. We already have an incredible amount of knowledge, and the success ...

The Earth's atmosphere were larger than previously thought. It is outside the orbit of the moon

The Earth's atmosphere were larger than previously thought. It is outside the orbit of the moon

the Earth consists of several layers: the troposphere (upper limit 20 km), stratosphere (50 km), mesosphere (border 85 km), thermosphere (690 km border) and ectosphere (limit of 10 000 km). For a long time as the conventional boundaries between Eart...

Comments (0)

This article has no comment, be the first!

Add comment

Related News

Mankind grows dull: scientists have noted a gradual decline in the level of human intelligence

Mankind grows dull: scientists have noted a gradual decline in the level of human intelligence

Norwegian scientists claim that humanity quickly becomes stupid. Brief excerpts from the researchers ' findings was published by MedicalXpress. The full results of the Norwegian studies experts published in the journal Proceedings...

Artificial intelligence predicted the results of world Cup 2018

Artificial intelligence predicted the results of world Cup 2018

Very soon in Russia will begin the world championship on football of 2018. Many will follow this event, including the bookmakers, who have tried to predict the outcome of the championship. Together with them, these results tried t...

Alien Apocalypse: what other civilization would have done with climate change?

Alien Apocalypse: what other civilization would have done with climate change?

in the face of climate change, deforestation and biodiversity loss, the creation of a stable civilization — the most important and necessary task of mankind. But as we approach the solution of this problem, we rarely ask ourselves...