Discovered a completely new type of galaxy
Astronomers from the University of Minnesota Duluth and the Museum of Natural Sciences, North Carolina have discovered a new class of ring-shaped galaxies. Found galaxy, dubbed PGC 1000714, has an elliptical core is not with one but with two outer rings. At the moment this is the only galaxy of this type, to meet scientists.
Most galaxies have a disk-like or spiral shape, but sometimes there are very unique designs. For example, the same lenticular galaxies, which are a sort of cross between spiral galaxies and disk-shaped, or irregular galaxies, which have indistinct structure almost amorphous. There are galaxies and ultra-low-density cluster of stars.
The "normal" ring galaxy, known as "Hoag's Object"
Under the classification of unusual galaxies fall and circular. These incredibly beautiful space objects have well-defined elliptical nucleus, surrounded by a ring of stars (unrelated). One of the most known galaxies of this type is the "Hoag's Object" (pictured above), discovered in 1950 and named after the famous astronomer and its discoverer Arthur Hoag. Ring galaxy, which is often called the "Hoag's Object", very rare in the universe - they account for less than 0, 1 percent from all we have observed galaxies - so the detection of even a single representative of this rare type, and even such unusual, very pleased with astronomers . According to an article published in the journal Monthly Notices of the Royal Astronomical Society, we can officially add to the list of these rare galaxies another newcomer, but the new discovered ring galaxy deserves the creation of a new subclass. The fact that its elliptical core is surrounded by two distinct and independent rings.
PGC 1000714 object or Burqin galaxy (named after the astronomer who discovered it Burqin Mutlu-Pakdil), located about 359 million light-years from us. Its unusual structure allows astronomers to better understand the issue of how galaxies formed and developed.
Left - pseudocolor image PGC 1000714. galaxy right - prefabricated two-colored image which can be seen the outer ring (blue) and more blurred inner ring (light green)
Analyzing the image of the galaxy in a different light spectra, the researchers found blue (age of about 0, 13 billion years), the outer ring surrounding the red (age of about 5, 5 billion years), the central elliptical core. However, unexpectedly themselves researchers also found and the second inner ring surrounding galactic center.
"We watched the galaxies with a blue ring around the central body of red before. The most famous such an object is "Hoag's Object". However, the uniqueness of the new discovered galaxy is that it has an additional second, older and discharged the red ring "- said Patrick Trotardt, an astrophysicist at the Museum of Natural Sciences, North Carolina and co-author of the study.
So far, astronomers are not ready to give a firm answer to the question of how galaxies are formed annular, however, most likely, the external borders of the galaxies are formed as a result of the collision gas.
"Different colors of inner and outer ring suggest that this galaxy has experienced two distinct periods of formation", - says Mutlu-Pakdil.
Scientists suggest that it would be virtually impossible to find out how the rings formed this particular galaxy.
"Whenever we find a unique or strange object for study, each time an event causes us to take a fresh look at our current theory of how the universe works. As a rule, every time it turns out that we need a lot more a lot to learn "- sums up Trotardt.