BeyondPlanck X. Planck LFI frequency maps with sample-based error propagation

Understand

We present Planck LFI frequency sky maps derived within the BeyondPlanck framework.

• This framework draws samples from a global posterior distribution that includes instrumental, astrophysical and cosmological parameters, and the main product is an entire ensemble of frequency sky map samples.
• This ensemble allows for computationally convenient end-to-end propagation of low-level instrumental uncertainties into higher-level science products.
• We show that the two dominant sources of LFI instrumental systematic uncertainties are correlated noise and gain fluctuations, and the products presented here support - for the first time - full Bayesian error propagation for these effects at full angular resolution.