Interpulse emission from pulsar 0950+08 - How many poles

Astronomy and Astrophysics – Astronomy

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Pulsars, Pulse Duration, Pulsed Radiation, Stellar Radiation, Fluctuation Theory, Frequency Response, Stellar Models, Stellar Rotation

Scientific paper

Consideration of the frequency dependence of emission over the entire pulse period shows that: (1) interpulse emission is accompanied by low level emission over at least 83% of the rotation period; (2) individual interpulses may be as strong as 60% of the average main pulse, by comparison to an average interpulse-main pulse ratio of 2%; (3) interpulses are correlated with main pulses; and (4) the interpulse-main pulse separation is frequency-independent between 100 and 5000 MHz, while (5) the average interpulse and main pulse widths vary as the -0.5 + or - 0.05 power of nu below 400 MHz. In addition, single-pole and double-pole models are considered and found to require additional ad hoc additions to explain the observations. The simplest alternative is the modification of the single-pole models in which the magnetic axis is nearly aligned with the rotation axis.

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