Freiburg 2008 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 75: Gammaastronomie IV

T 75.5: Vortrag

Donnerstag, 6. März 2008, 17:45–18:00, KGII-HS 2006

TeV Gamma-Ray Observations of the Binary Pulsar PSR B1259-63/ SS2883 near the 2007 Periastron with H.E.S.S. — •Matthias Kerschhaggl and Ullrich Schwanke for the H.E.S.S. collaboration — Humboldt Universität zu Berlin

The binary pulsar system PSR B1259-63/SS2883 is known as a variable TeV gamma-ray emitter since its first detection by H.E.S.S. around the last periastron in 2004. Being the first detected of the TeV gamma-ray binaries, similar to objects like LS 5039 and LS I +61 303, it represents a very interesting laboratory for the study of pulsar wind interactions with the ambient radiation field and circumstellar matter outflow from a massive companion star. The interaction mechanisms like particle acceleration due to pulsar wind termination shock dynamics and subsequent emission of TeV photons, are expected to become efficient near the periastron of the highly eccentric (e=0.87) pulsar orbit, where the separation between the two objects is ~0.7 AU. As the orbital period of the system is roughly 3.4 years the next periastron since the first VHE observations took place on July 27, 2007. The lack of pre-periastron VHE lightcurve data of this source motivated therefore a 60h H.E.S.S. observation campaign for this passage. The results of this campaign will be discussed, compared to previous data and interpreted within the framework of current models.