A Radio Pulsar Search of the Gamma-ray Binaries LS I +61 303 and LS 5039

Understand

LS I +61 303 and LS 5039 are exceptionally rare examples of HMXBs with MeV-TeV emission, making them two of only five known or proposed "gamma-ray binaries".

• There has been disagreement within the literature over whether these systems are microquasars, with stellar winds accreting onto a compact object to produce high energy emission and relativistic jets, or whether their emission properties might be better explained by a relativistic pulsar wind colliding with the stellar wind.
• Here we present an attempt to detect radio pulsars in both systems with the Green Bank Telescope.
• The upper limits of flux density are between 4.1-14.5 uJy, and we discuss the null results of the search.