12-20 July 2017
Asia/Seoul timezone
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BEXCO - Room F(201/202/203/204)

[GA082] Morphology studies and resolved spectroscopy of the Vela Jr. Supernova remnant with H.E.S.S.


  • Nukri KOMIN

Primary authors

  • Nukri KOMIN (University of the Witwatersrand, Johannesburg, South Africa)



Supernova remnants (SNRs) are widely considered to be the origin of Galactic cosmic rays. The SNR Vela Jr. (RX J0852.0-4622) is one of the prime sources for studies of particle acceleration aiming to test this paradigm due to its strong non-thermal emission across the whole electromagnetic spectrum, spanning from radio to very-high-energy (VHE, E>100 GeV) gamma-rays, and to its young age and proximity to Earth. Being the largest source in the TeV sky, it is one of a few remnants with well resolved shell-like morphology at VHE gamma rays. Here we present deep H.E.S.S. observations of Vela Jr. with roughly doubled exposure time comparing to previously published results. Strongly improved statistics together with new analysis techniques result in a firm determination of the cut-off in the gamma-ray spectrum and allow for detailed spatially-resolved spectroscopy studies. A revised flux measurement makes Vela Jr. the brightest steady source in the sky above 1 TeV, whereas a smooth connection of the H.E.S.S. spectrum to the one obtained at GeV energies with the Fermi-LAT provides an exciting opportunity to recover the present-time parent particle population in both leptonic and hadronic scenarios directly from the gamma-ray data alone. These new observations provide us with a deeper insight into the physical processes in SNRs.