A Space-based All-sky MeV gamma-ray Survey with the Electron Tracking Compton Camera

Understand

A sensitive survey of the MeV gamma-ray sky is needed to understand important astrophysical problems such as gamma-ray bursts in the early universe, progenitors of Type Ia supernovae, and the nature of dark matter.

• However, the study has not progressed remarkably since the limited survey by COMPTEL onboard CGRO in the 1990s.
• Tanimori et al.
• have developed a Compton camera that tracks the trajectory of each recoil electron in addition to the information obtained by the conventional Compton cameras, leading to superior imaging.