22-30 July 2021
North-West University
Africa/Johannesburg timezone
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The multi-wavelength behaviour of PSR B1259-63 during the 2021 periastron passage

Not scheduled
Potchefstroom Campus (North-West University)

Potchefstroom Campus

North-West University

Poster Presentation Track D1 - Astrophysics Astrophysics


Brian van Soelen (University of the Free State)


Gamma-ray binaries are a rare class of high mass binary system (less than 10 sources) that emit most of their non-thermal emission in the gamma-ray regime. The gamma-ray binary PSR B1259-63/LS 2883 consists of a young pulsar in a 3.4 year orbit around a Be star. Observations around previous periastron passages have shown increased non-thermal emission associated with the pulsar crossing the Be star’s circumstellar disc, as well as flares at gamma-ray energies around inferior conjunction, which exceed the pulsar’s spin-down luminosity. We undertook an extensive multi-wavelength campaign to observe the source at radio (ATCA), optical (SALT), X-ray (Swift) and gamma-ray (Fermi-LAT) energies during the most recent periastron passage in February 2021. We present the first results from this observational campaign and discuss their possible implications.

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Primary authors

Brian van Soelen (University of the Free State) Prof. Maria Chernyakova (Dublin City University) Dr Denys Malyshev (Universität Tübingen) Mr Samual Mc Keague (Dublin City University) Dr itumeleng Monageng (University of Cape Town) Dr Charlotte Sobey (CSIRO) Dr Shane O'Sullivan (Dublin City University)

Presentation Materials