Search for Off-pulse emission in Long Period Pulsars
Rahul Basu, Dipanjan Mitra, George I. Melikidze
TL;DR
This study re-examines off-pulse emission in long-period pulsars, correcting previous analysis errors, and reports new detections of low-level off-pulse emission in one pulsar, suggesting a possible emission mechanism near the light cylinder.
Contribution
It identifies and corrects analysis flaws in earlier studies and reports the first detection of off-pulse emission in a long-period pulsar using improved methods.
Findings
Off-pulse emission detected in PSR B0628-28 with a flux ratio of 0.25%.
Previous detections in other pulsars were due to data analysis leakage.
Proposes cyclotron resonance near the light cylinder as a possible emission mechanism.
Abstract
We have revisited the problem of off-pulse emission in pulsars, where detailed search for the presence of low level radio emission outside the pulse window is carried out. The presence of off-pulse emission was earlier reported in two long period pulsars, PSR B0525+21 and B2046-16 at frequencies below 1 GHz using the Giant Meterwave Radio Telescope (GMRT). However, subsequent studies did not detect off-pulse emission from these pulsars at higher radio frequencies (> 1 GHz). We have carefully inspected the analysis scheme used in the earlier detections and found an anomaly with data editing routines used, which resulted in leakage of signal from the on-pulse to the off-pulse region. We show that the earlier detections from PSR B0525+21 and B2046-16 were a result of this leakage. The above analysis scheme has been modified and offline-gating has been used to search for off-pulse emission…
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