The e-ASTROGAM is a gamma-ray space mission to be proposed as the M5Medium-size mission of the European Space Agency. It is dedicated to theobservation of the Universe with unprecedented sensitivity in the energy range0.2 - 100 MeV, extending up to GeV energies, together with a groundbreakingpolarization capability. It is designed to substantially improve the COMPTELand Fermi sensitivities in the MeV-GeV energy range and to open new windows ofopportunity for astrophysical and fundamental physics space research.e-ASTROGAM will operate as an open astronomical observatory, with a corescience focused on (1) the activity from extreme particle accelerators,including gamma-ray bursts and active galactic nuclei and the link of jetastrophysics to the new astronomy of gravitational waves, neutrinos, ultra-highenergy cosmic rays, (2) the high-energy mysteries of the Galactic center andinner Galaxy, including the activity of the supermassive black hole, the FermiBubbles, the origin of the Galactic positrons, and the search for dark mattersignatures in a new energy window; (3) nucleosynthesis and chemical evolution,including the life cycle of elements produced by supernovae in the Milky Wayand the Local Group of galaxies. e-ASTROGAM will be ideal for the study ofhigh-energy sources in general, including pulsars and pulsar wind nebulae,accreting neutron stars and black holes, novae, supernova remnants, andmagnetars. And it will also provide important contributions to solar andterrestrial physics. The e-ASTROGAM telescope is optimized for the simultaneousdetection of Compton and pair-producing gamma-ray events over a large spectralband. It is based on a very high technology readiness level for all subsystemsand includes many innovative features for the detectors and associatedelectronics.
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