Scientists have stated that the Andromeda galaxy has a peculiar core. Our nearest cousin galaxy is hiding a dark secret and from the looks of it, this secret is buried deep inside its core. The core of the Andromeda galaxy is a powerful source of gamma radiation and this probably is indicative of one of the biggest mysteries.
Scientists are now speculating to the presence of these extreme gamma rays suggesting that it could be the work of dark matter and its annihilation. There is a similar kind of signal that has been detected from our Milky Way too.
Dark matter is nothing like the matter we know all around us. First of all, the visible matter that we can see and measure in the universe only accounts for 15 percent of the total universal constitution. The rest is actually dark matter and the problem with this kind of substance is that it cannot be directly observed or measured. The only thing you can figure out with respect to Dark matter is how it interacts with everything around it on a gravitational level.
Up until now, it was hard to understand dark matter but the latest Fermi observation may just get us a step closer.
Astrophysicists for long have known that all galaxies emit gamma rays but the strength of the gamma radiation from the Andromeda center is indicative of something else entirely because it is really strange.
Typically, dark matter is believed to exist towards the innermost regions of galaxies including our Milky Way. However, the signals from Andromeda are highly compact. The speculation currently is that dark matter particles such as WIMPS collide and when they do, they annihilate. This releases a large energy burst that is observable in the gamma range. Because the Fermi space telescope sees everything in gamma radiations, it can precisely pinpoint the location of the dark matter.
This is not the only explanation though. There could be other plausible explanations and one such alternative is the concentration of pulsars deep inside the Andromeda galaxy that could be giving out collective gamma-ray signals. Unfortunately, because the Andromeda galaxy is 2.5 million light years away, it is hard to decipher the individual sources for these gamma rays.
Even the Milky Way is known to radiate gamma-rays at its core. It is the hope of researchers to compare the radiations received from Andromeda and our own core, that might lead to some answers. At least, we can clearly understand if the signals are indeed coming from Pulsars or something entirely different.
The good thing about studying the Andromeda galaxy is that it is quite similar to our own Milky Way and therefore finding answers is a matter of comparing the two with each other. Not only will this reveal a lot of the secrets of the cosmos but also give an idea of the formation of galaxies.