Speaker
Eva Leser
(Universität Potsdam/ DESY, D-15738 Zeuthen, Germany)
Description
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.
Primary authors
Eva Leser
(Universität Potsdam/ DESY, D-15738 Zeuthen, Germany)
Matthias Fuessling
(DESY, D-15738 Zeuthen, Germany)
Stefan Ohm
(DESY, D-15738 Zeuthen, Germany)
Co-authors
Anita Reimer
(Institut für Astro- und Teilchenphysik, Leopold-Franzens-Universität Innsbruck)
Jim Hinton
(Max-Planck-Institut für Kernphysik, Heidelberg, Germany)
Kathrin Egberts
(Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Strasse 24/25, D 14476 Potsdam, Germany)
Mathieu de Naurois
(Laboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS/IN2P3, F-91128 Palaiseau, France)
Olaf Reimer
(Institut für Astro- und Teilchenphysik, Leopold-Franzens-Universität Innsbruck)
Pol Bordas
(Max-Planck-Institut für Kernphysik, Heidelberg, Germany)
Stefan Klepser
(DESY, D-15738 Zeuthen, Germany)
