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| Paper: |
Drifting-nulling Interaction in PSR B0809+74 |
| Volume: |
302, Radio Pulsars, in Celebration of the Contributions of Andrew Lyne, Dick Manchester and Joe Taylor — a Festschrift Honoring Their 60th Birthdays |
| Page: |
203 |
| Authors: |
van Leeuwen, A. G. J.; Stappers, B. W.; Ramachandran, R.; Rankin, J. M. |
| Abstract: |
Both nulling and subpulse drifting are poorly understood phenomena. We probe their mechanisms by investigating how they interact in PSR B0809+74. We solve the subpulse alias order problem and find that one driftband represents one subbeam. From this we derive a subbeam-carousel rotation time of more than 200 seconds, much longer than predicted by theory. We find that after nulls the drift-pattern is changed and that it can remain stably different for about 150 seconds. With the alias mode known, we can now tie these drift-pattern changes to changes in emission-region geometry. We show that post-null emission originates deeper in the pulsar magnetosphere. Both this emission-height change and the striking increase in carousel-rotation time can be explained by a post-null decrease in gap height. This offers a glance at the circumstances needed to make the pulsar turn off so dramatically. |
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