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A 5.5-year Fermi LAT gamma-ray observation shows significant extendedemission at the position of the supernova remnant HB9 (G160.9+2.6). Thesignificance of the detection above the background for photon energies above0.2 GeV is 16$\sigma$. The gamma-ray flux above 0.2 GeV is (2.23E-8)photons/cm$^2$ s, and the corresponding luminosity above 1 GeV is 1.4E33 erg/s(for a source distance of 1 kpc). The spectrum of the source is best describedby a curved power-law (log-parabola). The gamma-ray spectrum of the source isconsistent with both leptonic and hadronic models, and the relevant physicalparameters in each case are derived. More studies on the ambient density in theregion of HB9 should be carried out to rule out or confirm hadronic andnon-thermal bremsstrahlung scenarios for the gamma-ray emission.

Fermi LAT Observation of Supernova Remnant HB9