27-31 August 2018
LVH, Luisenstraße 58, 10117 Berlin
Europe/Berlin timezone
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Contribution Talk

-1- Lecture hall
Gamma-rays

The Colliding Wind Binary Eta Carinae as seen with the H.E.S.S. telescopes

Speakers

  • Eva LESER

Primary authors

Co-authors

  • Mathieu DE NAUROIS (Laboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS/IN2P3, F-91128 Palaiseau, France)
  • Kathrin EGBERTS (Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Strasse 24/25, D 14476 Potsdam, Germany)
  • Pol BORDAS (Max-Planck-Institut für Kernphysik, Heidelberg, Germany)
  • Stefan KLEPSER (DESY, D-15738 Zeuthen, Germany)
  • Olaf REIMER (Institut für Astro- und Teilchenphysik, Leopold-Franzens-Universität Innsbruck)
  • Anita REIMER (Institut für Astro- und Teilchenphysik, Leopold-Franzens-Universität Innsbruck)
  • Jim HINTON (Max-Planck-Institut für Kernphysik, Heidelberg, Germany)

Abstract content

Eta Car is a colliding-wind binary composed of a massive luminous blue variable (~100 solar masses) and a companion star of O or B-type (~ 30 solar masses). Its orbit is very eccentric and has a period of 2023 days. Although the binary has a rich observational history in, e.g. the optical regime, strong experimental evidence for gamma-ray emission from the system has built up only recently. It is now the only colliding-wind binary showing emission in very-high energy gamma rays. Following its detection in high-energy gamma-rays by the Fermi-LAT in 2009, it was detected with 11 sigma in 30 h of observation with H.E.S.S. last year. The detection was made possible due to the addition of a fifth telescope with a 28 m diameter dish to the existing four telescopes in 2012. Here we present the results of the data analysis and discuss them in the context of current models.