# e-ASTROGAM mission: a major step forward for gamma-ray polarimetry

## TL;DR

e-ASTROGAM is a proposed gamma-ray space mission aiming to revolutionize high-energy astrophysics by providing unprecedented sensitivity, resolution, and polarimetric capabilities in the 0.15 MeV to 3 GeV range, enabling detailed studies of cosmic sources.

## Contribution

This paper introduces the e-ASTROGAM mission concept, highlighting its advanced polarimetric capabilities and expected scientific breakthroughs in understanding high-energy astrophysical phenomena.

## Key findings

- Simulations show e-ASTROGAM can measure polarization of various cosmic sources.
- Expected to provide insights into the geometry and magnetization of high-energy plasmas.
- Polarimetry will help understand radiation processes in astrophysical sources.

## Abstract

e-ASTROGAM is a gamma-ray space mission proposed for the fifth Medium-size mission (M5) of the European Space Agency. It is dedicated to the study of the non-thermal Universe in the photon energy range from ~0.15 MeV to 3 GeV with unprecedented sensitivity, angular and energy resolution, together with a groundbreaking capability for gamma-ray polarimetric measurements over its entire bandwidth. We discuss here the main polarization results expected at low energies, between 150 keV and 5 MeV, using Compton interactions in the e-ASTROGAM instrument, from observations of active galactic nuclei, gamma-ray bursts, microquasars, and the Crab pulsar and nebula. The anticipated performance of the proposed observatory for polarimetry is illustrated by simulations of the polarization signals expected from various sources. We show that polarimetric analyses with e-ASTROGAM should provide definitive insight into the geometry, magnetization and content of the high-energy plasmas found in the emitting sources, as well as on the processes of radiation of these plasmas.