TWO mysterious streams of radiation are emanating from the heart of our galaxy, and dark matter could explain them both. The question is: what kind of dark matter?
In 2003, data from the Wilkinson Microwave Anisotropy Probe (WMAP) revealed a “haze” of unexplained microwave radiation at the centre of the Milky Way. A year earlier, the satellite INTEGRAL found an unusual stream of gamma rays coming from the same region.
Various theories have attempted to explain these anomalies. Now two groups have come up with different explanations of how dark matter, the stuff thought to make up most of the…
