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Andromeda Galaxy is very different from our Milky Way Galaxy - VIDEO PDF Print E-mail
Sunday, 11 January 2015 13:08

A detailed study of the movement of different stellar populations in the disk of Andromeda, showed striking differences from the Milky Way. Structure and internal motion of stars in a spiral galaxy has an important place in the history of its formation. Andromeda Galaxy, also known as M31, is the nearest spiral galaxy to the "Milky Way", and is the largest in the local group of galaxies.

In the new study, led by graduate student Claire Dorman, he combined the data from two large studies of the stars in Andromeda. The first was held Keck Observatory in Hawaii and the other by a space telescope "Hubble".

High resolution images of the Hubble allowed to separate from each other stars in the Andromeda disk is full and wide spectral analysis allowed to divide the stars into groups according to their age. This was stated by Dorman on Thursday 8 January this year, at the winter meeting of the American Astronomical Society in Seattle. The study shows the dispersion number of young, middle and old stars in the disk of Andromeda.



Just Dorman said the analysis revealed a clear trend associated with aging stars. Since young stars spend rotational motion around the center of the galaxy, while older stars have less orderly movement. Ordered stars move in concert, with almost the same speed, while the old stars have a wider range of speeds.

The researchers looked at various scenarios for the formation and evolution of the galactic disk, which could explain these observations.

One scenario assumes a gradual loss of the ordered motion of the star, as a result of the merger with other galactic neighbors. Previous studies have found evidence of such mergers in the Andromeda Galaxy.

Alternative scenario involves the formation of the stellar disk originally thick massive disk of gas. When compared with the "Milky Way" revealed significant differences.

At present, the paradigm of structure formation of the Universe, and it is these large galaxies like Andromeda and the Milky Way. As scientists believe these galaxies grew by merging with other satellite galaxies and splice together their stars and gas.

Cosmologists predict that 70% of the size of the Andromeda galaxy and the Milky Way had to interact with at least one smaller galaxy in the last 10 000 years.


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