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

Date:

2018-06-14 10:00:06

Views:

29

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

Scientists have figured out how many people are required to travel to the nearest star system

Scientists have figured out how many people are required to travel to the nearest star system

Dreams of settling other planets, the mankind began to dream even long before we had the first spacecraft for manned flights. And with the opening over the last few decades several thousands of new exoplanets, some of which may well be habitable, or ...

A new form of matter may be beyond the periodic table

A new form of matter may be beyond the periodic table

currently, the heaviest element on the periodic table is ohannesson with an atomic mass of 294. He received the official title in 2016. As every element on the periodic table, Oganessian all of its mass is from the protons and neutrons (baryons), whi...

The average IQ of Europeans has declined since the 1970-ies

The average IQ of Europeans has declined since the 1970-ies

a Group of researchers from the Center for economic research, Ragnar Frisch in Norway found that performance IQ tests slowly decreased over the last several decades. In a paper published in PNAS, burnt Bratsberg and OLE Rogeberg described your resear...

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...