Unveiling the Fermi Bubbles origin with MeV photon telescopes

Abstract

The Fermi Bubbles (FB) are a pair of large-scale ellipsoidal structures extending above and below the Galactic plane almost symmetrically aligned with the Galactic Center. After more than 10 years since their discovery, their nature and origin remain unclear. Unveiling the primary emission mechanisms, whether hadronic or leptonic, is considered the main tool to shed light on the topic. We explore the potential key role of MeV observations of the FB and we provide a recipe to determine the sensitivity of Compton and Compton-pair telescopes to the extended emission of the FB. We illustrate the capabilities of the Imaging Compton Telescope COMPTEL, the newly selected NASA MeV mission COSI (Compton Spectrometer and Imager), as well as the expectations for a potential future Compton-pair telescope such as AMEGO-X (All-sky Medium Energy Gamma-ray Observatory eXplorer).

Submitted to ApJ

References in corpus (11)

• Giant Gamma-ray Bubbles from Fermi-LAT: AGN Activity or Bipolar Galactic Wind?
• The Spectrum and Morphology of the Fermi Bubbles
• The Fermi Bubbles: Giant, Multi-Billion-Year-Old Reservoirs of Galactic Center Cosmic Rays
• Detection of large-scale X-ray bubbles in the Milky Way halo
• AMEGO: Exploring the Extreme Multimessenger Universe
• The Spatially Uniform Spectrum of the Fermi Bubbles: the Leptonic AGN Jet Scenario
• Compton telescope with coded aperture mask: Imaging with the INTEGRAL/IBIS Compton mode
• Multi-wavelength Emission from the Fermi Bubble I. Stochastic acceleration from Background Plasma
• COSI: From Calibrations and Observations to All-sky Images
• Search for TeV emission from the Fermi Bubbles at low Galactic latitudes with H.E.S.S. inner Galaxy survey observations
• Spatial structure of the WMAP-Planck haze

Cited by in corpus (8)

• The All-sky Medium Energy Gamma-ray Observatory eXplorer (AMEGO-X) Mission Concept
• Dark Matter prospects with COSI: ALPs, PBHs and sub-GeV Dark Matter
• Prospects of future MeV telescopes in probing weak-scale Dark Matter
• Exploring sub-GeV Dark Matter Physics with Cosmic Ray and Future Telescopes
• Indirect searches for realistic sub-GeV Dark Matter models
• Exploring the MeV Sky with a Combined Coded Mask and Compton Telescope: The Galactic Explorer with a Coded Aperture Mask Compton Telescope (GECCO)
• Constraining light dark matter in vector-scalar portals with COSI and AMEGO-X
• Diffuse continuum emission and large extended sources at MeV energies