Radio Emission Signatures in the Crab Pulsar

Details Radio Emission Signatures in the Crab Pulsar Radio Emission Signatures in the Crab Pulsar

2007-08-18

arxiv.org/abs/0708.2505v1

Astronomy and Astrophysics

Astrophysics

26 pages, 10 figures, to appear in ApJ

Scientific paper

10.1086/522362

Our high time resolution observations of individual pulses from the Crab pulsar show that both the time and frequency signatures of the interpulse are distinctly different from those of the main pulse. Main pulses can occasionally be resolved into short-lived, relatively narrow-band nanoshots. We believe these nanoshots are produced by soliton collapse in strong plasma turbulence. Interpulses at centimeter wavelengths are very different. Their dynamic spectrum contains regular, microsecond-long emission bands. We have detected these bands, proportionately spaced in frequency, from 4.5 to 10.5 GHz. The bands cannot easily be explained by any current theory of pulsar radio emission; we speculate on possible new models.

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