Shell like Supernova Remnants Observed with Fermi-LAT
2019 July 22
Supernova Remnants (SNRs) emitting gamma rays in the GeV-TeV energy range are key for identifying the accelerators of Galactic cosmic rays. Recently H.E.S.S. has revealed at TeV energies three new candidate shell Supernova Remnants (SNR): HESS J1534-571, HESS J1614-518 and HESS J1912+101. A radio SNR candidate has been identified as a counterpart to HESS J1534-571, therefore it is classified as a SNR. We will report on the Fermi-Large Area Telescope (LAT) analysis of HESS J1534-571 and HESS J1614-518 using 10.5 years of Pass 8 data. Within the sky region covered by HESS J1614-518, lies an additional point source, which we have identified as a new gamma-ray pulsar through the detection of pulsations in the Fermi-LAT data. If this new pulsar is associated with the extended emission observed by the Fermi-LAT and H.E.S.S., this hint to a classification of HESS J1614-518 as a composite SNR/PWN. An in-depth analysis of the Fermi-LAT spectra of these two sources in conjunction with H.E.S.S. results can help to discriminate between hadronic and leptonic emission mechanisms. These findings could be further strengthened by future multi-wavelength observations.