A search for radio pulsations in LS I +61 303

Astronomy and Astrophysics – Astrophysics

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Scientific paper

LS I +61 303 is a radio emitting high-mass X-ray binary that shows variable emission from radio to TeV energies with its orbital period of 26.5 days. This is one of the three X-ray binaries clearly detected up to now at TeV energies and, as it is the case for LS 5039, the nature of the compact object is unknown. We have searched for pulsed radio emission from LS I +61 303 using the phased array mode of GMRT. Simultaneous data from the multi-bit phased array (PA) back-end and the polarimeter (PMTR) were taken at 1280 MHz. Three runs of data were performed lasting 3, 2 and 1 hours, respectively. No pulses have been found, what places a sub-mJy upper limit for a possible millisecond pulsed emission from LS I +61 303.

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