# Beam-deconvolved Planck LFI maps

## TL;DR

This paper presents beam-deconvolved maps from Planck LFI data to improve beam symmetry, providing auxiliary data products and analyzing residual signals and noise characteristics across frequency channels.

## Contribution

It introduces beam-deconvolution maps using the artDeco code for Planck LFI data, offering improved beam symmetry and auxiliary data products for further analysis.

## Key findings

- Residual signals detected in 30-GHz and 44-GHz channels
- Noise covariance matrices generally agree with half-ring estimates
- Asymmetry observed in $EE$ and $BB$ noise spectra at 44 GHz

## Abstract

The Planck Collaboration made its final data release in 2018. In this paper we describe beam-deconvolution map products made from Planck LFI data using the artDeco deconvolution code to symmetrize the effective beam. The deconvolution results are auxiliary data products, available through the Planck Legacy Archive. Analysis of these deconvolved survey difference maps reveals signs of residual signal in the 30-GHz and 44-GHz frequency channels. We produce low-resolution maps and corresponding noise covariance matrices (NCVMs). The NCVMs agree reasonably well with the half-ring noise estimates except for 44 GHz, where we observe an asymmetry between $EE$ and $BB$ noise spectra, possibly a sign of further unresolved systematics.