# Studying the magnetized ISM with all-sky polarimetric radio maps

## TL;DR

This paper discusses how all-sky polarimetric radio maps of synchrotron radiation can significantly enhance our understanding of the galactic interstellar medium and magnetic fields through improved imaging technology.

## Contribution

It introduces advancements in low frequency array technologies enabling high-fidelity, broadband polarimetric imaging of the sky, which addresses limitations of current heterogeneous datasets.

## Key findings

- Enhanced resolution and calibration accuracy in radio maps
- Potential for comprehensive ISM and magnetic field studies
- Transformational dataset for astrophysical research

## Abstract

Synchrotron radiation from the interstellar medium (ISM) of our galaxy dominates the sky brightness at low radio frequencies, and carries information about relativistic and thermal electron distributions across a range of astrophysical environments. The polarization of the radiation, as modified by Faraday rotation effects in the ISM, also contains extensive information about the magnetic field. Comprehensive all-sky broadband mapping of this radiation, when combined with high frequency radio data, gamma ray data, cosmic ray (CR) measurements and sophisticated modeling, can revolutionize our understanding of the ISM and the processes that influence its evolution. Current widefield imagery of the galactic synchrotron emission is heterogeneous in frequency coverage, sky coverage, angular resolution and calibration accuracy, limiting utility for ISM studies. A new generation of all-digital low frequency array technologies is opening a path to matched resolution, high fidelity polarimetric imaging across a fully sampled swath of radio frequencies from a few tens to many hundreds of MHz, generating a transformational dataset for a broad range of scientific applications.