«Hubble» photographed a unique «one-armed» galaxy

© Photo : ESA/Hubble & NASAГалактика NGC 4625 in the constellation Canes venatici«Hubble» photographed a unique «one-armed» galaxy© Photo : ESA/Hubble & NASA

. Orbital Observatory «Hubble» received pictures of a very unusual galaxy NGC 4625, which has not four or two, but only one spiral arm, reports the website of the space telescope.

Today believe the astronomers and the cosmologists, the universe contains an approximately equal number of elliptical and spiral galaxies, significantly differing not only in its form, but also the history of formation and the types of stars they inhabit are formed.

In contrast to the rather monotonous elliptical galaxies, spiral galaxies look very gaudy. They may have two, four or a greater number of «sleeves» in their center may be a so-called bridge, a particular dense group of stars, and the very form of spirals can vary considerably.

One of the most unusual «stellar cities» such as telling the science team the Hubble, is the galaxy NGC 4625, located in the constellation Canes venatici at a distance of 30 million light years from Earth.

This is a large spiral galaxy has one very strange feature – it has only one spiral arm. The reason for this, as show pictures from «Hubble» in ultaviolet, is that in the recent past this galaxy collided with some other object, which «tore off» the second spiral and created a powerful flash of star formation in the outskirts of NGC 4625.

«Culprit» of this cosmic «accident», according to astronomers, is the dwarf galaxy NGC 4618, the satellite is «one-armed» NGC 4625. This is supported by the fact that the outskirts of the dwarf galaxies in the recent past have interacted with its larger neighbor, however, not all scientists today agree with such a hypothesis.

Now, according to the astronomers, the «stolen» sleeve gradually being restored within them have begun to form new stars. In the next few tens of millions of years «one-armed» NGC 4625 will lose its distinctive shape will turn into a normal spiral galaxy with two arms.

The observation of the process, according to scientists, will give us a unique chance to see how was formed the milky Way and other spiral galaxies, and to understand under what conditions they can turn into elliptical galaxies like today according to some astronomers.