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e-ASTROGAM is a gamma-ray space mission proposed for the fifth Medium-sizemission (M5) of the European Space Agency. It is dedicated to the study of thenon-thermal Universe in the photon energy range from ~0.15 MeV to 3 GeV withunprecedented sensitivity, angular and energy resolution, together with agroundbreaking capability for gamma-ray polarimetric measurements over itsentire bandwidth. We discuss here the main polarization results expected at lowenergies, between 150 keV and 5 MeV, using Compton interactions in thee-ASTROGAM instrument, from observations of active galactic nuclei, gamma-raybursts, microquasars, and the Crab pulsar and nebula. The anticipatedperformance of the proposed observatory for polarimetry is illustrated bysimulations of the polarization signals expected from various sources. We showthat polarimetric analyses with e-ASTROGAM should provide definitive insightinto the geometry, magnetization and content of the high-energy plasmas foundin the emitting sources, as well as on the processes of radiation of theseplasmas.

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