New optical polarization measurements of the Crab pulsar

Details New optical polarization measurements of the Crab pulsar New optical polarization measurements of the Crab pulsar

2005-11-21

arxiv.org/abs/astro-ph/0511636v1

Astrophysical Sources Of High Energy Particles And Radiation. AIP Conference Proceedings, Volume 801, pp. 306-311 (2005)

Astronomy and Astrophysics

Astrophysics

AIP Conference Proceedings "Astrophysical Sources of High Energy Particles and Radiation", eds. T. Bulik et al. (NY:AIP), Volu

Scientific paper

10.1063/1.2141887

The Crab nebula and its pulsar have been observed for about 3 hours with the high-speed photo-polarimeter OPTIMA in January 2002 at the Calar Alto 3.5m telescope. The Crab pulsar intensity and polarization are determined at all phases of rotation with higher statistical accuracy than ever. Therefore, we were able to separate the so-called 'off-pulse' phase emission (with an intensity of about 1.2% compared to the main peak, assumed to be present at all phases) from the pulsed emission and show the 'net' polarization of the pulsed structures. Recent theoretical results indicate that the measured optical polarization of the Crab pulsar is similar to expectations from a two-pole caustic emission model or a striped pulsar wind model.

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