New Results from the MW Campaign to Observe the 2010/2011 Periastron Passage of the Binary Pulsar System PSR B1259-63/LS 2883

Details New Results from the MW Campaign to Observe the 2010/2011 Periastron Passage of the Binary Pulsar System PSR B1259-63/LS 2883 New Results from the MW Campaign to Observe the 2010/2011 Periastron Passage of the Binary Pulsar System PSR B1259-63/LS 2883

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915323a&link_type=abstract

American Astronomical Society, AAS Meeting #219, #153.23

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Scientific paper

PSR B1259-63/SS 2883 is a unique binary system consisting of a 47.7 ms radio pulsar orbiting a massive Be companion star. The interaction between the pulsar's relativistic wind and the Be star's stellar wind around and photon field around periastron is believed to give rise to the unpulsed radio, X-ray, and gamma-ray emissions observed near periastron. Despite designated 3-weeks of observations by EGRET around periastron no GeV gamma-ray emission was observed. We have observed the system in radio, IR, optical, X-ray, GeV, and TeV gamma-ray during the 2010/2011 periastron passage. Our observations of the system in the 0.1-10 GeV energy range around periastron with Fermi showed an unexpected behavior of the system that is not seen at any other wavelength. Our upper limits on GeV emission from this source when it was far from periastron gives a very low gamma-ray efficiency of the pulsar which is an order of magnitude lower than that expected for it's age and distance. We will present results from our MW campaign on the emphasizes on the new findings with Fermi and discuss the possible physical interpretation of the new data.

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