. Both British and American scientists independently found nine small dwarf satellite galaxies around our Milky Way. According to them, dwarf galaxies could be the answer to dark matter and how bigger galaxies form. A dwarf galaxy can be described as a galaxy with fewer than 100 star to many billion stars. This is an extremely small number, astronomically. The Milky Way’s 200 million and 400 trillion stars are present. On Tuesday, scientists from the Dark Energy Survey, which has its headquarters at the US Department of Energy’s Fermi National Accelerator Laboratory in the USA, as well as an independent group of Cambridge researchers, announced their results. Sergey Koposov stated that he was shocked to see so many satellites in such a narrow area of sky. Image: University of Cambridge. Both teams relied on data from the Dark Energy Survey’s first year to complete their analyses. The data are publicly accessible. This is an important result in astronomy as well as physics. Dr. Alex Drlica Wagner of Fermilab said that the satellite galaxy was a tiny celestial object, which orbits larger galaxies due to gravitational attitudinal attraction. It is extremely difficult to find satellite galaxies with less than 100 star count. The newly discovered satellite galaxies, which are billion times fainter and less mass than our own galaxy, have been found to be a millionth as large. 100,000 is the nearest. Sergey Koposov of the Institute of Astronomy, University of Cambridge was the lead author of the Cambridge team. He said that “The discovery of many satellites within such a small region of the sky was totally unexpected.” It was hard to believe what I saw. Astrophysicists previously discovered over two dozen of these satellite galaxies orbiting the Milky Way. The Sloan Digital Sky Survey discovered 2005-2006 half of these satellite galaxies. This survey later evolved into the Dark Energy Survey. The rate of discovery dropped dramatically after the initial surge and then slowed down for five years. The previously-discovered dwarf satellite galaxies are in blue and the newly discovered candidates are in red. The Milky Way can be seen in the middle of the sky as the horizontal light. Image: Yao Yuan Mao. Ralf Kaehler. Risa Wechsler. A new section of sky is being observed by the Dark Energy Survey. This survey covers a smaller portion of sky than the Sloan Digital Sky Survey. Today’s announcement reveals that dwarf galaxies were found in the initial five years of Dark Energy Survey data. This area covers approximately one third of the sky the Dark Energy Survey will be studying. After going through all of the Dark Energy Survey data, researchers expect to have discovered 30 satellite galaxies. The latest findings will have to be confirmed. Researchers on either side of the Atlantic agree that their small size and distance from the centre of the Milky Way are strong indicators of potential candidates. Researchers have more chances to study dark matter. The newly discovered galaxies offer researchers more options to look for dark matter signatures. Dark-matter-dominated dwarf satellites contain more mass than stars in unseen material. It is unknown what dark matter looks like. According to the authors, it may be composed of particles that destroy each other and emit gamma radiations. Because dwarf galaxies lack other sources of gamma radiation, it is an ideal place to look for evidence of dark matter destruction. These authors believe that more detailed research on these satellite galaxies can lead to sensitiver searches for dark matter. In a separate announcement today, the Large Area Telescope Collaboration (NASA’s Fermi Gamma-Ray Telescope Mission) stated that there was no significant excess in gamma radiation from new Dark Energy Survey objects. They stated that this result shows how new optical telescope discoveries can quickly be translated into fundamental physics tests. Peter Michelson is the spokesperson for Large Area Telescope (LAT). He stated that although we did not find significant emission using the LAT, the dwarf galaxies discovered by DES are important targets in the search for dark matter. Even if they don’t lead to the identification of particle-dark matter, they can certainly help to limit its properties.” A five year project that will photograph large swathes of southern skies in unparalleled detail. The Dark Energy Survey is the world’s strongest digital camera. The world’s strongest digital camera, the 570 8 megapixel Dark Energy Camera is its primary instrument. The camera can detect galaxies up to 8 billion light-years away from Earth. A prototype for the Dark Energy Camera is built by scientists. (Image from Fermilab). The prototype of the Dark Energy Camera was constructed and tested at Fermilab. It is mounted now on the Victor M. Blanco 4-meter telescope located at Cerro Tololo inter-American Observatory in Chile. Dark Energy Survey is a five-year project that aims to understand more about dark energy. This mysterious force makes up around 70% all the matter and energy in our Universe. Scientists believe dark energy may be the answer to why the Universe expands at an increasing rate. Keith Bechtol works at the University of Chicago’s Kavli Institute for Cosmological Physics and led the Dark Energy Survey analysis. He said that the Dark Energy Camera was a great instrument for finding small satellite galaxies. The camera has both a large field of vision to rapidly map the sky, and a high sensitivity that allows us to see very faint stars. This shows how powerful and important the camera’s data will continue to be over many years.
There are nine dwarf galaxies that orbit our galaxy, one million times smaller than our Milky Way
