Are there dark doings near the center of the Milky Way? That may be so when it comes to the collision of dark matter particles. Although such particles are invisible, we could still theoretically see the mess they make when they collide. It’s this idea that leads physicists to scour the galaxy for some glimmer of dark matter collisions. Spot a line produced by a pair of gamma-rays emanating from just the right spot and you may have found coveted clues to the dark matter mystery.
Now a collaboration of scientists using the Fermi Gamma-Ray Spacecraft’s Large Area Telescope instrument (Fermi–LAT) has confirmed seeing an unusual gamma-ray line near the galactic center. If the finding stands up to further scrutiny, it’s possible this line comes from the annihilation of dark matter.
In April theoretical physicist Christoph Weniger, now at the GRAPPA Institute in Amsterdam, analyzed Fermi–LAT’s publicly available data and spotted a strange gamma-ray line near the galactic center. There’s no known astrophysical event that can tidily explain this line—but the collision of dark matter particles might. If that were the case, it would be a major discovery: Once physicists spot the products of such an annihilation, they could begin to understand the particles that collided.
But there was a catch: Weniger is not a member of the Fermi-LAT collaboration and therefore cannot be able to account for the quirks of their instrument. What was needed was a weigh-in from Fermi-LAT collaboration physicists; they know the data best and would be able to confirm any hint of dark matter.