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van den Heuvel |
The Gamma-ray Binaries LS 5039 and LS I+61 303 in the GLAST Era
M. Virginia McSwain
Lehigh University
Paul Ray
Naval Research Lab
Mallory Roberts
Eureka Scientific
Scott Ransom
NRAO
LS 5039 and LS I+61 303 are exceptionally rare examples of HMXBs with MeV-TeV emission, making them two of only four known "gamma-ray binaries". Both have long been modeled as microquasars with stellar winds accreting onto a compact object, producing high energy emission and relativistic jets. However, their emission properties might be better explained by a relativistic pulsar wind colliding with the stellar wind. To resolve the controversy, we are exploiting a unique opportunity to combine GLAST monitoring with a coordinated multiwavelength campaign to identify the nature of the two sources and understand the high energy emission mechanisms. We will present preliminary results from our ongoing RXTE, optical, and radio flux monitoring as well as pulsar searches with the Green Bank Telescope.
