This is the best summary I could come up with:

What makes this gamma-ray signal even stranger is the fact that it is located toward another unexplained feature in space, the source of some of the most energetic cosmic particles ever detected.

The CMB was first spotted by American radio astronomers Robert Wilson and Arno Penzias in May 1964 as microwave radiation in all directions of the sky over Earth.

The team turned to Fermi and its Large Area Telescope (LAT), which scans the entire sky over Earth several times a day to gather and collate many years of data.

Because of the effects of special relativity and the high-energy nature of gamma rays, such a dipole should be five times as prominent in this data as it is in the low-energy microwave light of the CMB.

There is a corresponding dipole in the showers of high-energy charged particles that comprise UHECRs as they arrive at Earth, which was first spotted by the Pierre Auger Observatory in Argentina back in 2017.

The team’s findings were presented at the 243rd meeting of the American Astronomical Society in New Orleans, Louisiana, by Kashlinsky and are discussed in a paper published on Wednesday (Jan. 10), in The Astrophysical Journal Letters.

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