Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20910402h&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #104.02; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
We have made ultra-high time resolution measurements of individual giant pulses from the Crab Nebula pulsar. We find that the time and frequency signatures of the interpulse are distinctly and dramatically different from those of the main pulse. The giant pulses occurring at the phase of the main pulse can occasionally be resolved into short-lived nanoshots which span modest fractional bandwidths. We believe that these nanoshots are produced by soliton collapse in strong plasma turbulence. At centimeter wavelengths the giant interpulses are very different. Their dynamic spectrum contains well-defined, narrow, microsecond-long emission bands. We have detected these proportionally spaced bands from 4.5 to 10.5 GHz. The interpulse frequency structure can easily be distinguished from interstellar decorrelation effects by its distinctive behavior on short timescales. We show here examples of both the main pulse and interpulse, and we speculate on possible new models for the emission.
Eilek J. a.
Hankins Timothy H.
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