SkyFACT: High-dimensional modeling of gamma-ray emission with adaptive templates and penalized likelihoods

Understand

We present SkyFACT (Sky Factorization with Adaptive Constrained Templates), a new approach for studying, modeling and decomposing diffuse gamma-ray emission.

• Like most previous analyses, the approach relies on predictions from cosmic-ray propagation codes like GALPROP and DRAGON.
• However, in contrast to previous approaches, we account for the fact that models are not perfect and allow for a very large number ($\gtrsim10^5$) of nuisance parameters to parameterize these imperfections.
• We combine methods of image reconstruction and adaptive spatio-spectral template regression in one coherent hybrid approach.