The Fermi Gamma-ray Space Telescope from NASA recently discovered a signal from the center of the out neighbour galaxy Andromeda galaxy. This symbolizes the presence of a very mysterious material called dark matter. The gamma-ray signal is quite similar to that seen by Fermi at the center of our personal Milky Way galaxy. Gamma-rays happen to be the highest energy light form that is generated by most energetic phenomena in this universe. These are more common in galaxies such as the Milky Way as the cosmic rays particles move pretty close to the speed of light and generate gamma rays as these interact with starlight and interstellar gas clouds.
To their surprise, the data received from Fermi shows that gamma rays present in Andromeda, also named as the M31, are restricted to the center of galaxy in place of dispersing all throughout. In order to explain this unusual distribution, the team of scientists propose that emission might be generated from unknown sources. And one of these sources could be dark matter, a completely unknown substance that makes up for most part of this universe. According to Pierrick Martin, an astrophysicist working at the National Center for Scientific Research as well as the Research Institute in Astrophysics and Planetology located in Toulouse located in France, “We expect dark matter to accumulate in the innermost regions of the Milky Way and other galaxies, which is why finding such a compact signal is very exciting. M31 will be a key to understanding what this means for both Andromeda and the Milky Way.”
Other possible source for this kind of emission can be a very intense concentration of pulsars in the center of M31. These constantly spinning neutron stars have mass almost double than that of sun and are counted as one of the densest objects in this cosmos
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