NASA ’s Fermi Telescope has looked at the Vasco da Gamma - ray discharge of M31 , the Andromeda Galaxy , and discovered the largest fraction of this hefty radiation sickness come from the core of the galaxy , very much like in our ownMilky Way . The outside squad of researcher has considered this theme song as potential collateral evidence of dark affair .
Some theoretical models predict Vasco da Gamma - ray emission when dark subject particle interact with each other . Dark thing does n’t care interact at all , it does n’t form cluster or clouds , so these Vasco da Gamma - ray signal might only happen in dense regions , like at the core of galaxies .
“ We wait dark matter to accumulate in the innermost regions of the Milky Way and other galax , which is why finding such a heavyset sign is very exciting , ” order lead scientist Pierrick Martin , an astrophysicist at the National Center for Scientific Research and the Research Institute in Astrophysics and Planetology in Toulouse , France , in astatement . “ M31 will be a paint to understanding what this means for both Andromeda and the Milky Way . ”
While the signal is clearly there , the cause is very much a issue of debate . The researchers themselves tell how this could be caused from several unnamed source . The signature tune in the Milky Way could have been due to a very powerful pulsar accord toanother work .
The research is go to be published in theAstrophysical Journaland highlights how we can practice a dissimilar galax to learn more about our own . Andromeda is the closest galaxy to the Milky Way of comparable mass , and a space of 2 million clear - years is a saunter in the park away in cosmic terms .
“ Our galaxy is so alike to Andromeda , it really help us to be capable to study it , because we can instruct more about our galaxy and its establishment , ” tell co - author Regina Caputo , a research scientist at NASA ’s Goddard Space Flight Center in Greenbelt , Maryland . “ It ’s like living in a earth where there ’s no mirror but you have a twin , and you may see everything physical about the Gemini . ”
The study highlights one authoritative difference , though . Andromeda seems to bring about eminent - vim mote , known as cosmic rays , unlike the Milky Way . Cosmic rays also produce Vasco da Gamma irradiation when they interact with throttle cloud , but there ’s no gamma ray emanation outside the core of Andromeda , while gamma rays from cosmic rays are found everywhere in the Milky Way .
“ We do n’t fully understand the part cosmic beam of light play in galaxies , or how they travel through them , ” said Xian Hou , an astrophysicist at Yunnan Observatories , Chinese Academy of Sciences in Kunming , also a lead scientist of this study . “ M31 permit us see how cosmic ray behave under conditions dissimilar from those in our own galaxy . ”
More observations will be necessary to understand the author of Andromeda ’s gamma beam of light and we ’ll likely learn something about our own island - universe as well .
