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X-Ray and Gamma-Ray Observations of the Fermi Bubbles and NPS/Loop I Structures

Nakashima, Shinya; Inoue, Yoshiyuki; Kataoka, Jun +3 more

The Fermi bubbles were possibly created by large injections of energy into the Galactic Center (GC), either by an active galactic nucleus (AGN) or by nuclear starburst more than ~10 Myr ago. However, the origin of the diffuse gamma-ray emission associated with Loop I, a radio continuum loop spanning across 100° on the sky, is still being debated. …