A team of astronomers led by David Sand of the University of Arizona has identified five examples of different types of different galactic systems, shaped like tiny dwarf galaxies: systems dubbed by the authors as “blue bubbles”. Clearly separated from any potential parent galaxy at a distance of more than 300,000 light-years, the stars distributed in random patterns made up of blues and youth.
The system was discovered by astronomers after a team from the Netherlands Institute for Radio Astronomy compiled a catalog of nearby galaxies with possible new galaxies. With the publication of the catalog, researchers in Sand’s team used different telescopes to search for possible stars related to gas clouds. Initially, they believed that clouds were related to galaxies.
In fact, most likely, but the first collection of discovered stars showed researchers something amazing: the collection, called “SECCO1”, is one of the strange “blue blobs” and part of the Virgo cluster, a cluster of galaxies. Discovered. About 40 million light years from you. Like other systems, this collection is made up of very few hydrogen gases by young stars.
Atomic hydrogen is an important “component” of star formation, as compounds develop over time into dense clouds of molecular hydrogen gas before new stars are formed. Jones explains that most of the systems analyzed have low molecular weight, but that does not mean that there is an absence of molecular gas. “In fact, there must be some atomic gas, because they are still forming stars; The existence of young stars, mostly, and little air, suggests that these systems may have lost air recently, ”he suggested.
The combination of blue stars and small gases, with a lack of old stars in the system, was unexpected for the authors. “Stars born red have a smaller mass and therefore live longer than blue stars, which burn their fuel and die young; So the old red stars are usually the last ones left, “said Jones.
They die precisely because they do not have much air to form new stars, leaving the blue stars in the “oasis” of the desert. Furthermore, the high concentration of metals in the galaxy indicates that they are formed from the gases of large galaxies by various processes. One involves gravitational tidal forces, which occur when two galaxies come together and expel air and stars by gravity.
Another possibility is that some galaxies have fallen into a cluster filled with hot air “on its belly”; As a result, the gas is expelled from the cluster, creating observable objects. The team prefers this explanation because of the blue bubbles, which in turn must have moved too fast to separate, which do not match the gravitational tide as they reduce the “expulsion” of air.
Articles with study results can be accessed in the online repository arXivWithout peer review.
Source: arXiv; Via: University of Arizona