NOVA: Another Blow for Dark Matter Interpretation

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NOVA: Another Blow for Dark Matter Interpretation

Post by bystander » Mon Aug 06, 2018 4:00 pm

Another Blow for the Dark Matter Interpretation of the Galactic Center Excess
Netherlands Research School for Astronomy | 2018 Aug 06
For almost ten years, astronomers have been studying a mysterious diffuse radiation coming from the centre of our Galaxy. Originally, it was thought that this radiation could originate from the elusive dark matter particles that many researchers are hoping to find. However, physicists from the University of Amsterdam/GRAPPA and the Laboratoire d’Annecy-le-Vieux de Physique Théorique have now found further evidence that rapidly spinning neutron stars are a much more likely source for this radiation. Their findings are published today in Nature Astronomy.

Observations of the gamma-ray radiation from the Galactic centre region with the Fermi Large Area Telescope have revealed a mysterious diffuse and extended emission. Discovered almost 10 years ago, this emission generated a lot of excitement in the particle physics community, since it had all the characteristics of a long-sought-after signal from the self-annihilation of dark matter particles in the inner Galaxy.

Finding such a signal would confirm that dark matter, a substance that so far has only been observed through its gravitational effects on other objects, is made out of new fundamental particles. Moreover, it would help to determine the mass and other properties of these elusive dark matter particles. However, recent studies show that arguably the best astrophysical interpretation of the excess emission is a new population in the Galactic bulge of thousands of rapidly spinning neutron stars called millisecond pulsars, which have escaped observations at other frequencies up to now. ...

The Fermi-LAT GeV Excess Traces Stellar Mass in the Galactic Bulge - Richard Bartels et al
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