Sunday, November 25, 2012
Irregular galaxies tend to become disks
Through the use of Hubble and Keck telescopes, astronomers have come to a rather startling conclusion about the nature, which is the process of change in the "blue" galaxies. Specifically, it relates to a process of change that takes place in these galaxies has for now as eight billion years - in other words, for the period, which is more than half the age of the universe.
Until now, it was assumed that the disk-shaped galaxy with a classic for these galaxies form, appeared in the universe, in its present form, about 8 billion years ago, and only slightly changed in all that time.
However, recent observations suggest otherwise. As it turned out, the galaxies continued steady process of change during this time. In such ideal spiral galaxies as a nebula of Andromeda or the Milky Way, as the movement of star clusters and single stars, there is perfect order, in one direction, and one for all around the galactic center. However, in the most distant blue galaxies, stars behaving erratically are moving in many directions at once. At the same time, as noted by astronomers at these "irregular" galaxies, there is a tendency to what would achieve the orderly, "right" and the one-way traffic. In other words, these galaxies tend to take the form of regular spiral galaxies.
The blue color of galaxies suggests that they are actively forming stars. As soon as the light from them is close to "our time" in these galaxies, a decrease of random motion of stars with increasing speed of the galaxy as a whole. While blue galaxies themselves are beginning to take shape, the approach to the classical form of spiral galaxies such as the Milky Way.
I should also mention the fact that the early observations were made exclusively for blue galaxies, which originally had been the correct form, completely ignoring the "wrong" of the galaxy. Currently, scientists have already identified possible "candidates" that have emission lines sufficiently clear and bright, which may see how they move within the star clusters. Emission lines are set, consisting of discrete wavelengths which are emitted by the galactic gas. Thus, the objects of attention from scientists became 544 blue galaxies, which are located at a distance from the Milky Way in the range of 2 to 8 billion years.
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