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NASA Fermi telescope to expand the search for dark matter

via:博客园     time:2016/8/15 9:30:18     readed:9843

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Although we do not know what dark matter is, but our results show that we can study in detail the shaft subclass particle model, minimizing the possible mass range

Dark matter is a composition of matter in the universe majority mysterious substance has been elusive. Although tests carried out on the ground and in space have not yet found traces of dark matter, but the results help scientists ruled out the possibility of some theories. Earlier this year released three studies, the use of more than six years Fermi Gamma-ray Space Telescope data collected, using a new method to expand the tracking of dark matter. Fermi project scientist Julie McEnery said all along, we are using common methods in an ordinary looking place, and now we're going to start to use some innovative ways.

Dark matter neither emit nor absorb light, mainly interacts with the remaining part of the universe through gravity, but accounted for 80% of all matter in the universe. Distortion occurs when galaxies by astronomers through the galaxy's rotation, and light simulation of the early universe, the discovery of dark matter produced. The most likely is a series of different kinds of hypothetical dark matter particles. Previously, Fermi detected in the Milky Way galaxy running around with other central dwarf galaxies have dark matter significantly associated with gamma-ray signal.

Although no exact findings, but the results still exclude the possibility of interaction with mass ratio within a certain range, further reduced the possibility of dark matter particles might have certain characteristics. In the new study, the most special is made to explore the possibility of dark matter axions or other particles with similar properties thereof. Particles axis subclass can be converted into gamma rays when they interact with a strong magnetic field, turn back to the original way in which the conversion process will leave some trace feature. Manuel Meyer Stockholm University research team led by the galaxy NGC 1275 in gamma rays, which is located in the center of the Perseus cluster of galaxies, about 240 million light-years from Earth.

NGC 1275 emission of high-energy radiation is thought to its central supermassive black hole has a relationship. Like other galaxy clusters like Perseus cluster of galaxies is filled with hot gas and magnetic fields interwoven, mutually beneficial conversion of gamma rays and the axion class particles. Meyer's team collected a wide area Fermi Space Telescope (LAT) data, search distorted gamma-ray signal. The results ruled out the possibility of the shaft subclass particles contain 4% dark matter. Meyer said that although we do not know what dark matter is, but our results show that we can study in detail the shaft subclass particle model, minimizing the possible mass range. Another possibility is that dark matter particles called weakly interacting massive particles (WIMPs), in some cases, colliding particles WIMPs neither destroy each other, it does not produce the rapid decay of intermediary particles.

In both cases, so that the gamma rays to be detected LAT. Regina Caputo University of California, search for those signals the Small Magellanic Cloud (SMC) in. Small Magellanic Cloud, about 200,000 light-years from Earth, is the second largest operation around the Milky Way satellite galaxies. In the search for dark matter SMC favorable factor is that it is relatively close distance from us, but it is by the gamma-ray pulsar star birth and produced such traditional factors, scientists have a better understanding.

More importantly, the astronomers were able to accurately measure out SMC's rotation curves, which can reflect its rotation speed is how as it is transformed from the center, which can show how much dark matter exists. A third study conducted by Marco Ajello SLAC National Accelerator Laboratory and Clemson University, led by Mattia Di Mauro is studied from different angles. They do not carry out research on a specific target, but studied more than six and a half years of LAT data, analysis of the entire sky in gamma-ray background.

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