EU: astronomers first saw the invisible galaxy

28.02.2005

28.02.2005


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An international team of astronomers announced the discovery of the first in the history of the invisible galaxy. According to the online edition of Space.com, it is composed mainly of dark matter, and there are no stars.

The property is situated at a distance of 50 million light-years from Earth in the constellation Virgo, but it can not be observed in the visible spectrum. First galaxy, dubbed VIRGOHI21, was discovered in 2000 by Lovell radio telescope at the Observatory of the University of Manchester. However, scientists have until recently been reluctant to announce his discovery to carefully validate all the data.

Astronomers from Cardiff University studied the hydrogen emission in the radio and came to the conclusion that the accumulation of this gas exceeds the mass of the Sun is a hundred million times. However, the speed of rotation of the object was so large that it can not be attributed solely to the mass of hydrogen. Therefore, the gravitational foundation had to be something else.

From the speed, the researchers found that the mass of the galaxy to a thousand times the mass of hydrogen contained in it. From this they concluded that the object fills in the rest of the invisible dark matter, and its amount is 500 times greater than the volume of ordinary matter.

Scientists have only theoretically suggest, although it was a long time ago and that most of the universe consists of matter called dark matter. Its presence is required to explain the extra gravitational forces that help maintain communication between normal galaxies and their clusters.

It is believed that the knots of dark matter were the nucleus of future stars and galaxies. After the birth of the universe is dark matter condensed about the same as a drop of water on a spider web. These sites would be attracted ordinary matter in the form of hydrogen, and by increasing the density of the star infancy.

Ordinary matter that makes up stars, planets and people, only 4 percent of the total volume of the universe. Dark matter accounts for 23 percent of the total mass and energy. And the rest of the universe fills even more mysterious dark energy.

Battery News, 24.02.2005 18:40
Source: lenta.ru

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