Geodetic Precession in PSR J1141-6545
Abstract
We present observations that show dramatic evolution of the mean pulse profile of the relativistic binary pulsar J1141-6545 over a period of five years. These data indicate that the spin axis of the pulsar is precessing due to relativistic spin-orbit coupling. Observations made between 1999 and 2004 with a number of instruments at the Parkes radio telescope demonstrate a steady, secular evolution of the mean total intensity profile. The width of the profile increases by more than 50 percent during the five year period, indicating that geodetic precession is moving our line of sight closer to the axis of the pulsar beam. This is supported by analysis of the changing position angle of the linearly polarised component of the mean profile. We find that the slope of the position angle swing across the centre of the pulse steepens with time and use a simplified version of the rotating vector model to constrain the magnitude and direction of the change in our line of sight angle relative to the pulsar spin axis. The fact that we appear to be moving deeper into the emission cone is consistent with the non-detection of this pulsar in previous surveys of the same region of sky.Keywords
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