News Picks : Gamma-ray signal less likely to be evidence of dark matter
New Scientist: In 2010 a team of researchers using the Fermi Gamma-Ray Space Telescope spotted an unexpectedly bright glow from the center of the Milky Way galaxy. They thought the most likely explanation was the annihilation of putative dark-matter particles. Subsequent signals from other sources seemed to support that idea. However, earlier this year two teams independently found thousands of previously unknown pulsars that could account for most of the gamma-ray signal. Because our galaxy may not be the only one that has dark matter crashing and burning at its center, Kevork Abazajian of the University of California, Irvine, and his colleagues used the most recent data from Fermi to look for similar gamma-ray signals in nearby dwarf galaxies. But so far they have found none.