Scientists received the evident certificate that growth of galaxy is limited at the expense of new stars. Supervision showed that new stars throw out gas streams which could go on a further increment of their quantity out of galaxy limits. The group of researchers of Germany, Canada and the USA used ALMA radio telescope for supervision. This tool is sensitive to a radio emission of submillimetric range. Studying the central part of a galaxy of NGC 253 scientists found some gas streams proceeding out of its limits. Thus the principle of supervision based on registration of radio waves, allowed to see only streams of the gas consisting of a monoxide of carbon that is carbon monoxide. The chemical composition of gas specifies that streams of substance are formed not at the expense of hot plasma of stars (it consists generally of hydrogen), and at the expense of the cold interstellar gas picked up by a star wind.
Before emergence of the serious technical problems connected with full leakage of liquid helium on a space telescope Hubble, it managed to make one more important and interesting opening. Hubble found two stars, which already finished the evolution and turned into white dwarfs, at distance about 150 light years from Earth. In comparison with ordinary dwarfs, who has quite neutral atmosphere, the atmosphere of these two stars has a set of elements – construction blocks, which are responsible for formation of firm planets. These two stars were found by tools of an orbital telescope in Hyades scattered star congestion in constellation of the Taurus. Age Hyades makes about 625 million years. According to the researchers from the Cambridge University for them became a big surprise when they found construction elements in the atmosphere of two white dwarfs found telescope Hubble.
An international team of astronomers from Australia, Germany, Switzerland, and Finland has discovered a rare dwarf galaxy, called LEDA 074886, which has a striking resemblance to an emerald cut diamond. The astronomers discovered the rectangular shaped galaxy within a group of 250 galaxies some 70 million light years away. As said Associate Professor Alister Graham from Swinburne University of Technology in the Universe around us, most galaxies exist in one of three forms: spheroidal, disc-like, or lumpy and irregular in appearance.
The myriad faint stars that comprise the Antlia Dwarf galaxy are more than four million light-years from Earth, but this NASA/ESA Hubble Space Telescope image offers such clarity that they could be mistaken for much closer stars in our own Milky Way. This very faint and sparsely populated small galaxy was only discovered in 1997. This image was created from observations in visible and infrared light taken with the Wide Field Channel of Hubble’s Advanced Camera for Surveys.
The Hubble Space Telescope recently spied a cluster of young blue stars surrounding a rare mid-weight black hole that suggests the black hole was once at the center of a dwarf galaxy. Astronomers think this galaxy was torn apart by the gravity of a larger host galaxy that it orbited. The violent encounter would have stripped away most of the dwarf galaxy’s stars, but it also could have compressed the gas around its central black hole, triggering a new wave of star formation. It is these new stars that Hubble recently saw signs of. The observations suggest that the young stars must be less than 200 million years old, meaning the collision between the parent galaxy and its dwarf likely occurred around that time.
An international team of scientists led by David Martinez-Delgado (Max Planck Institute for Astronomy, Germany) has conducted research that reveals a “stealth merger” of dwarf galaxies, where an in-falling satellite galaxy is nearly undetectable by conventional means yet has a substantial influence on its host galaxy. Researchers used the Subaru Telescope to obtain high-resolution images of individual stars in a dense stream of stars in the outer regions of a nearby dwarf galaxy (NGC 4449), these outlying stars are the remains of an even smaller companion galaxy in the process of merging with its host.
According to new study small newfound galaxy with an oddball shape may be the product of a close encounter with a neighboring galaxy in what scientists are calling a “stealth merger”. The cosmic discovery came as astronomers investigated an isolated dwarf galaxy known as NGC 4449, which is about 12.4 million light-years away and is a “starburst galaxy,” meaning it forms young stars at a furious pace. This galaxy has a distorted shape as well, a look that is wreathed in hydrogen gas abounding with rings, shells and a core spinning the opposite way of the galaxy.
Astronomers have discovered a small galaxy that is invisible to telescopes and may be completely composed of dark matter, which reflects no light.The newfound galaxy is incredibly distant and extremely small. It orbits as a satellite of a larger galaxy. Though telescopes can’t spot the dwarf galaxy, scientists detected its presence through the tiny distortions its gravity causes to light that passes it by. The new dwarf galaxy is about 7 billion light-years away. It weighs about 190 million times the mass of the sun. According to study co-author Matthew Auger of the University of California, Santa Barbara this is the lowest mass galaxy that they have seen at this distance by far.
Astronomers have spotted the fastest rotating star yet found, a massive and bright young star located in our neighboring dwarf galax, the Large Magellanic Cloud.