Jiamusi Pulsar Observations: I. Abnormal emission events of PSR B0919+06

TL;DR

This study reports the detection of 92 abnormal emission events in PSR B0919+06 over 30 hours, revealing four event types and suggesting they result from magnetospheric emission changes.

Contribution

First comprehensive observation of abnormal emission events in PSR B0919+06, classifying four types and analyzing their occurrence and impact.

Findings

92 abnormal events detected in 30 hours

Events occur randomly every 1000-3000 periods

Events affect the pulse profile's leading edge by up to 2%

Abstract

PSR B0919+06 generally radiates radio pulses in a normal phase range. It has been known for its occasional perplexing abnormal emission events wherein individual pulses come to an earlier phase range for a few tens of periods and then returns to its usual phase. Heretofore, only a few such events have been available for study. We observed PSR B0919+06 for about 30 hours using the Jiamusi 66-m telescope at Jiamusi Deep Space Station at S-band, and detected 92 abnormal emission events. We identify four types of events based on the abrupted or gradual phase-shifting of individual pulses. The abnormal emission events are seen to occur randomly some every 1000 to 3000 periods, and they affect the leading edge of the mean profile by up to 2\% in amplitude. The abnormal emission events are probably related to gradual changes of emission processing in the pulsar magnetosphere.