http://arxiv.org/abs/1802.05636
The origin of sub-TeV gamma rays detected by Fermi-LAT from the Fermi bubbles at the Galactic center is still unknown. In a hadronic model, acceleration of protons and/or nuclei and their subsequent interactions with gas in the bubble volume can produce observed gamma rays. Such interactions naturally produce high-energy neutrinos, and detection of those can discriminate between a hadronic and a leptonic origin of gamma rays. Additional constraints on the Fermi bubbles gamma-ray flux in the TeV range from recent HAWC observations restrict hadronic model parameters, which in turn disfavor Fermi bubbles as the origin of a large fraction of neutrino events detected by IceCube along the bubble directions. We revisit our hadronic model and discuss future constraints on parameters from observations in very high-energy gamma rays and neutrinos.
S. Razzaque and L. Yang
Fri, 16 Feb 18
17/42
Comments: 8 pages, 4 figures. Invited article submitted to MDPI journal Galaxies for its special issue, Searching for Connections among the Fermi Bubbles, the Galactic Center GeV Excess, and Loop I, edited by D. Malyshev
You must be logged in to post a comment.