Aug 4 – 8, 2015
America/Detroit timezone

A search for dark matter annihilation in the newly discovered dwarf galaxy Reticulum 2

Aug 4, 2015, 4:00 PM
Michigan (Michigan League)


Michigan League

Cosmology and Dark Matter Experiment AstroParticle, Cosmology, Dark Matter Searches, and CMB


Alex Geringer-Sameth (Carnegie Mellon University)


I will present results from a search for gamma-ray emission in nine Milky Way satellites recently discovered in the Dark Energy Survey. The nearest of these, Reticulum 2, shows evidence for a signal in public Fermi data. The detected emission is consistent with annihilating dark matter with a particle mass less than a few hundred GeV. Different ways of treating the background yield different significances -- ranging from 2.3 sigma to greater than 3.7 sigma (after trials) -- and I will discuss the caveats involved. I will discuss tests that any dark matter interpretation must pass.
Oral or Poster Presentation Oral

Primary author

Alex Geringer-Sameth (Carnegie Mellon University)

Presentation materials