Gamma-Rays from Pion Production in the Milky Way Halo

Details Gamma-Rays from Pion Production in the Milky Way Halo Gamma-Rays from Pion Production in the Milky Way Halo

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aps..apr.b8006m&link_type=abstract

American Physical Society, 2009 APS April Meeting, May 2-5, 2009, abstract #B8.006

Physics

Scientific paper

Low-energy cosmic rays (CRs) below the ``knee'' are believed to be produced by galactic sources (supernova remnant shocks, pulsars) and are trapped in the galactic magnetic fields whereas higher-energy CRs, up to ˜10^18 eV, are leaking from the Galaxy. In a recent work, a model of the ``Galactosphere'' --- the up-scaled analog of the Heliosphere --- has been suggested to exist around the Milky Way and produce lower-energy CRs at the galactic termination and bow shocks. We proposed the observational test of the model via pion-produced gamma-rays generated by these TeV ``anomalous extra-galactic CRs'' propagating through the Galactic halo and interacting with hydrogen gas in high-velocity clouds (HVCs) and inside the Galaxy. We estimate the peak of the gamma-ray spectrum to be in the 10 GeV range, hence the signal from HVCs and the north-south galactic asymmetry of the gamma-ray background are potentially detectable by LAT on board of FermiGST.

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