Suzaku Detection of Diffuse Hard X-ray Emission around Jupiter : Inverse Compton Scattering by MeV electrons ?

摘要

Our detection of diffuse hard X-ray emission around Jupiter with Suzaku XIS is reported. To investigate X-ray emission from Jupiter, Suzaku XIS observation data are analyzed. Thanks to the lowest particle background among all X-ray CCDs in orbit, diffuse X-ray emission around Jupiter is detected in 1-5 keV with the X-ray luminosity of ~ 3 × 10~(15) erg s~(-1). Its emission spatially coincides with the Jupiter's radiation belts and Io's orbital path. Its spectrum is represented by a power law model with a photon index of ~1.4. The emission is discussed in the context of the origin and emission mechanism.