Dark Matter Lacks Certain Axion-Like Particles

Illustration of how light is transformed into ALP by the galaxy. 

For the first time the researchers used data from NASA’s gamma-ray telescope on the Fermi satellite to study light from the central galaxy of the Perseus galaxy cluster in the hunt for ALPs. The researchers found no traces of ALPs and, for the first time, the observations were sensitive enough to exclude certain types of ALPs (ALPs can only constitute dark matter if they have certain characteristics).

One cannot detect ALPs directly but there is a small chance that they transform into ordinary light and vice versa when travelling through a magnetic field. A research team at Stockholm University used a very bright light source, the central galaxy of the Perseus galaxy cluster, to look for these transformations. The energetic light, so-called gamma radiation, from this galaxy could change its nature to ALPs while traveling through the magnetic field that fills the gas between the galaxies in the cluster.

“The ALPs we have been able to exclude could explain a certain amount of dark matter. What is particularly interesting is that with our analysis we are reaching a sensitivity that we thought could only be obtained with dedicated future experiments on Earth”, says Manuel Meyer, post-doc at the Department of Physics, Stockholm University.

Searches for ALPs with the Fermi telescope will continue. More than 80 percent of the matter in the Universe remains to be identified. The mysterious dark matter shows itself only through its gravity, it does neither absorb nor radiate any form of light.

Contacts and sources:
Manuel Meyer, postdok, Fysikum, Stockholm University
Jan Conrad, professor, Fysikum, Stockholm University