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Title:
Optical polarization of the Crab pulsar: precision measurements and comparison to the radio emission
Authors:
Slowikowska, Agnieszka; Kanbach, Gottfried; Kramer, Michael; Stefanescu, Alexander
Affiliation:
AA(IESL, Foundation for Research and Technology, 71110 Heraklion, Crete, Greece; Nicolaus Copernicus Astronomical Center, Rabianska 8, 87-100 Torun, Poland), AB(Max-Planck-Institut für extraterrestrische Physik, Garching bei München, Germany), AC(University of Manchester, Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL), AD(Max-Planck-Institut für extraterrestrische Physik, Garching bei München, Germany)
Publication:
HIGH TIME RESOLUTION ASTROPHYSICS: The Universe at Sub-Second Timescales. AIP Conference Proceedings, Volume 984, pp. 51-59 (2008). (AIPC Homepage)
Publication Date:
02/2008
Origin:
AIP
PACS Keywords:
Radiation mechanisms; polarization, Pulsars, Photometric, polarimetric, and spectroscopic instrumentation, Radio sources
DOI:
10.1063/1.2896946
Bibliographic Code:
2008AIPC..984...51S

Abstract

We present the polarization of the Crab pulsar and its environment based on about 14 hours of observations with the high-speed photo-polarimeter OPTIMA at the 2.5 m Nordic Optical Telescope, La Palma. Time resolution as short as 10 mus and high statistics allow the derivation of fine details in the degree and angle of linear polarization. The phase resolved optical polarization is compared to the lightcurves at radio wavelengths and a surprising correspondence of optical polarization and radio emission is revealed. This subtle connection between presumed coherent and non-coherent emissions, which have also been detected between the giant radio pulses and the optical intensity of Crab, will require more elaborate theoretical models than those available in the literature.
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