The center of the Milky Way galaxy is mysteriously glowing, and of course, there’s a whole bunch of stars out there, along with a black hole 4 million times the mass of the sun, but, as light is subtracted from all of that, the region remains inundated with a mysterious plus gamma radiation.
According to RT, it is called the GeV Excess (GCE), and scientists have baffled since its discovery by physicists Lisa Godino and Dan Huber in 2009, and in data from NASA’s Fermi Telescope, they found excess gamma radiation, shaking some One of the most energetic light in the universe.
Physicist Mattia De Moreau, of the National Institute of Nuclear Physics in Italy, said his analysis points to dark matter as the culprit in GCE. This was first put forward as an explanation by Godino and Huber.
It is known that there is a mysterious mass responsible for the effects of gravity, which cannot be explained by things that we can discover directly – natural matter such as stars, dust, gas and galaxies.
For example, galaxies rotate much faster than they should if their gravity is affected by natural matter. Gravitational lens – the curvature of space-time around massive objects – is much stronger than it should be, and everything that creates this extra gravity is beyond our ability to directly detect.
And we only know dark matter through the effect of gravity on other objects, and there is a lot of it out there.
Nearly 80% of all matter in the universe is dark matter, although we cannot see a scrap of it.
The researchers suggested that if certain dark matter particles called WIMPS (weakly interacting massive particles) and their antiparticles collide, they would annihilate each other and explode in a barrage of other particles, including gamma ray photons, and they said this explanation fits the data surprisingly. Other physicists weren’t convinced, with one even describing the explanation as “shaky.”
And in 2018, another team of scientists suggested that very old, dead stars called pulsars could cause an overflow, which is reasonable, because the galactic center is so crowded and dusty and so vibrant – it would be very easy to miss one or more stars.
Recent studies also found that the GCE distribution is not smooth – as you would expect from the dark matter annihilation – but rather lumpy and speckled, which the pulsar team interpreted as compatible with point sources, such as stars.
Then another team came and decided that thin gamma radiation could be produced by dark matter, which brought it back to the table, however, more researchers created a series of comprehensive models of the galactic center with the annihilation of dark matter using a range of masses across the most researched systems, and they found that WIMPs are unlikely to be the cause of GCE.
De Mauros study compares data from the Fermi telescope over the past 11 years, with measurements of other astronomical anomalies recorded by Pamelas cosmic ray detector aboard Resurs-DK No. 1 and the Alpha Magnetic Spectrometer aboard the International Space Station.
In particular, the study uses the largest set of data from Fermi, collected over the past year, and reduces the uncertainty caused by the background radiation. De Mauro said this provided information about the spatial distribution of GCE, which could help rule out different interpretations. .
He explained: “If the excess, for example, results from the interaction between cosmic rays and atoms, then we would expect to observe their greater spatial distribution at lower energies, and their lower propagation at higher energies due to the diffusion of cosmic particles. My study, on the other hand, confirms how the distribution is.” The spatial increase does not change as a function of energy. ”
This, he said, had not been observed before, and could be explained by dark matter, because we think dark matter particles should have similar energies.
He continued: “The analysis clearly shows that the increase in gamma rays is concentrated in the center of the galaxy, which is exactly what we would expect to find in the heart of the Milky Way if dark matter was in fact a new type of particle.”
In a second preprint paper, de Morrow and his colleague Martin Wolfgang Winkler of Stockholm University in Sweden attempted to search for excess gamma rays in nearby dwarf spherical galaxies, and found nothing, but this blank discovery made it possible to impose restrictions on the mass of the dark matter particle. These restrictions, they said, are compatible with the GCE.
So does that mean that dark matter is causing GCE? No – and at the same time we can’t say that dark matter doesn’t cause it either, and basically, everything is as baffling as before, and we’re going to need some cool science (and a lot of observations, probably) So we get to solve it.