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How was the Andromeda galaxy formed?

How was the Andromeda galaxy formed? The nearest large galaxy to our milky way is a cluster of stars in Andromeda, scientists know that our galaxy and Andromeda are flying with great speed to each other and in a couple million years will merge into a celestial dance. But in order to know more about Andromeda, scientists decided to find out how is it formed?
It turns out that Andromeda galaxy was formed in the collision of smaller galaxies, there was a space accident about three billion years ago. The earth as a planet was already on its orbit, and the Sun was shining over her!
Sure about the date of the formation of the galaxy is difficult, since it stars all completely different in age, moreover, the age difference is sometimes very large.
Solve the puzzle took scientists from France, led a team of experts astronomer Francois hammer (Francois Hammer), if desired, it can be found in the Paris Observatory. So scientists modeled the whole process on a super powerful computer. The input data of the program have been quite a lot, two million photo images in good quality, total weight of one terabyte. After the model was built, scientists were able to paint the mechanism of the formation of the star system. More details can be found on the website of the Paris Observatory.
Scientists in their conclusions relied on previously made discovery, it turns out in Andromeda stars move not systematically, in different hand, can be said, that is chaotic. If we compare it with our galaxy, we have all the stars moving through certain orbits around the center of the galaxy. In Andromeda it is not so and this to some extent confirms the hypothesis that galaxy more recently.
Presumably 10 billion years ago, to meet each other flew two galaxies, one more than the other at times. On the mathematical model, the scientists were able to show itself a cosmic accident, the result is a familiar to us the Andromeda galaxy, as it is formed the system is about 2.2 billion years ago. If you are interested in the topic, then the journal Monthly Notes of the Royal Astronomical Society has a more extensive article with the calculations of French scientists.

Andromeda galaxy 1 : Disk formation

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