The Thousand-Pulsar-Array programme on MeerKAT XIV: On the high linearly polarized pulsar signals
arxiv(2024)
摘要
The S-shaped swing of the linear polarization position angle (PPA) observed
in many pulsars can be interpreted by the rotating vector model (RVM). However,
efforts to fit the RVM for a large sample of pulsars observed with the MeerKAT
telescope as a part of the Thousand-Pulsar-Array (TPA) programme, only
succeeded for about half the cases. High time-resolution studies suggest that
the failed cases arise due to the presence of orthogonal polarization modes, or
highly disordered distribution of PPA points. One such example is
PSR J1645-0317. Recently it has been shown that the RVM can be recovered in
this pulsar by using only time samples which are greater than 80
polarized. In this work we test this novel approach on the brightest 249
pulsars from the TPA sample, of which 177 yield sufficient highly polarized
samples to be amenable to our method. Remarkably, only 9 of these pulsars (5
now fail to fit the RVM as opposed to 59
result favours the paradigm that the underlying mechanism is coherent curvature
radiation.
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