Dancing of small galaxies around the deer leap


Credit: Instituto de Astrofísica de Canarias

IAC researchers have used the ESA satellite Gaia data to use the 39 dwarf galaxy motion. This data gives information on the dynamics of these galaxies, their stories and their interaction with the Milky Way.


There are many small galaxies (dwarf galaxies) around the Milky Way, a decade decade that may be decades or even millions less than soft. Dwarf galaxies have fewer stars than normal or giant galaxies, and have lower brightness.

This small galaxy was the study of astronomers' international team, headed by Tobias Chris Fritz and Giuseppe Battelia, both Institute of Astro-De Astrophics de Canarias (IAC) researchers. Thanks to the data obtained by the ESA Gaia Space Mission, which became possible in April 2018, the researchers managed to change the 39 DNA galaxy variable, which determines the direction and speed.

Before the second version of Gaia satellite data, it was impossible to analyze such measurements for the galaxy 29. Researchers have discovered that many of them move in airplane as a large polar structure. "It is already known that this plane has been discovered even more massive dwarf galaxies, but now we know that this little structure can have some massive dwarf galaxies," says Fritz, chief scientific expert.

Battaglia emphasizes that the origin of the enormous polar structure is not yet clear, but its characteristics stand out to challenge the spacecraft's galactic formation. In addition, a large magnetic cloud can be found in this planetary structure that can have two connections.

Analysis of the data related to solicitations, the team found that some dwarf galaxies have orbits that are placed around the inner regions of the sun. Gravitational attraction, which is a galaxy around these galaxies, can be compared with the action of pirates. It is probable that some of the dwarf galaxies studied examined these waves, which are attached to the stream.

"This may explain the features of observation of some objects such as Hercules and Crater II," says Fritz.

On the other hand, new questions arise. "Over the years, some galaxies have noticed that we had some peculiarities that could be easily detected in Milky Way (eg Karina I)," says Battalion. "However, their orbit does not appear to prove this hypothesis, perhaps, that we may be guilty of clashes with other dwarf galaxies."

Researchers have discovered that most of the galaxies studied their orbit (acute point on the acute path). Nevertheless, basic physics explains that they have to spend most of their time around their orbit (around the surrounding area). "This indicates that there is still a lot of dwarf galaxies that are still not found around and around the deer around it," said Fritsi.

Dwarf galaxies, apart from their own interests, are one of the few controllers for dark matter that can be used in the outer parts of the Milky Way. It is believed that such an issue is about 80 percent of the total mass of the universe. However, it is impossible to observe and find it difficult. Movements of dwarf galaxies can be used to measure the volume of the total mass. This is an exceptional exception to the massive mass of the object, which is determined to determine the size of the dark matter. According to these data, researchers could have realized that the dark matter in the Milky Way has a huge amount of roughly 1.6 trillion solar masses.


Learn further:
Four newly discovered deer jump neighbors

Მet Information:
H Chris Fritz and others. Gaia DR2 adequate petitions for dwarf galaxies at 420 km, Astronomy and astrophysics (2018). DOI: 10.1051 / 0004-6361 / 201833343

Journal Reference:
Astronomy and astrophysics

Provided by:
Instituto de Astrofísica de Canarias