12-20 July 2017
BEXCO
Asia/Seoul timezone
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Contribution

BEXCO - Room C(108)

[GA156] First Results of Eta Car Observations with H.E.S.S. II

Speakers

  • Eva LESER

Primary authors

Co-authors

Description

Eta Car is a colliding-wind binary that shows non-thermal emission from hard X-rays to high-energy gamma rays. The gamma-ray spectrum exhibits two spectral components, where the high-energy component extends up to 300 GeV. Previous observations of Eta Car with the High Energy Stereoscopic System (H.E.S.S.) resulted in upper limits. With the addition of the large 28-m central telescope to the H.E.S.S. array in 2012 the lower bound on the energy range has significantly been reduced. This lowers the energy threshold of the analysis compared to the published results due to the improved instrument sensitivity at energies below 400 GeV. Eta Car has been regularly observed in the following years with H.E.S.S. II. Here we report on the first results of Eta Car observations, which also cover the periastron passage in 2014 - the time of maximum gamma-ray emission seen in GeV gamma-rays with Fermi-LAT.