Dark Matter Eldorado - Galaxies near our galaxy has recorded a mysterious mass populous intensity.
Galaxies near our galaxy has recorded a mysterious mass populous intensity.
Some observations ensure that compared to other galaxies, faint star group behind the Milky Way has the highest density of matter gelapyaitu invisible material believed to be 83 percent of the total mass of the universe.
This discovery is reported online July 28 at arXiv.org by Joshua Simon of the Carnegie Observatories in Pasadena, California, with Marla Geha of Yale University and their colleagues, provide a great resource for astronomers trying to unveil the nature of dark matter.
When astronomers discovered the galaxy Segue 1 in 2007, they were not sure it was a galaxy, perhaps just a bunch of stars out of the Sagittarius dwarf galaxy. But observations using the Keck II telescope on Mauna Kea in Hawaii now confirm the status of Segue 1 as a galaxy because its stars have a chemical composition that is different, said Simon.
Observations made using the Anglo-Australian Telescope near Coonabarabran, Australia, also found a diversity of stellar composition in Segue 1, as reported by a team of which was Rosemary Wyse of Johns Hopkins University in Baltimore in an article published on arXiv.org in early August.
After checking the composition of the stars, the team calculated the total amount of mass in Segue 1, both of invisible dark matter as well as a small number of faint stars visible, by measuring the speed of the movement of the stars. The faster the stars they orbit close to the center of Segue 1, the heavier the galaxy.
The team found that although the stars in Segue 1 have a combined mass of more than about 1,000 solar masses, the mass of the entire galaxy about 500 times larger. "It was informed that Segue 1 is made almost entirely of dark matter," said Simon.
Segue 1 is not only dominated by dark matter but also solid. Dark matter density is higher than any known galaxy far. High density and distance of galaxies that close to Earth, about 80,000 light-years away, making it an ideal place as the reason for the study of dark matter.
"It's important to know the properties of dark matter galaxies," says Wyse. Galaxies like Segue 1, which has a small amount of material seem to interfere with the gravity of dark matter, the best place to reveal the distribution and the true nature of the material invisible.
Anyway, some primitive chemical composition of stars in Segue 1 can provide information about the formation and evolution of some of the oldest stars in the universe.
As well as particles of matter and antimatter can mutually eliminate one another in the interaction to produce large quantities of gamma rays, as well as particles of dark matter cancel out each other, depending on what exactly the material it is made invisible. In theory, the higher the density of dark matter, the higher the ratio destruction.
Space telescope beam Gama Fermi, as well as telescopes earth to record strong radiation which might be due to the destruction or annihilation, should therefore make the galaxy as the main target, said Simon. "The detection of annihilation of dark matter would be a new breakthrough for both Astronomy and Particle Physics, and the first step is to figure out where it is, "he said.
