The Crab Pulsar at Centimeter Wavelengths: I. Ensemble Characteristics

Abstract

We have observed the pulsar in the Crab Nebula at high radio frequencies and high time resolution. We present continuously sampled data at 640-ns time resolution, and individual bright pulses recorded at down to 0.25-ns time resolution. Combining our new data with previous data from our group and from the literature shows the dramatic changes in the pulsar's radio emission between low and high radio frequencies. Below about 5 GHz the mean profile is dominated by the bright Main Pulse and Low-Frequency Interpulse. Everything changes, however, above about 5 GHz; the Main Pulse disappears, the mean profile of the Crab pulsar is dominated by the High-Frequency Interpulse (which is quite different from its low-frequency counterpart) and the two High-Frequency Components. We present detailed observational characteristics of these different components which future models of the pulsar's magnetosphere must explain.

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Cited by in corpus (6)

• The Crab Pulsar at Centimeter Wavelengths II: Single Pulses
• 5 GHz TMRT observations of 71 pulsars
• Wide-Band Spectra of Giant Radio Pulses from the Crab Pulsar
• Statistics of VHE gamma-Rays in Temporal Association with Radio Giant Pulses from the Crab Pulsar
• Single Pulse Dispersion Measure of the Crab Pulsar
• Measurements of the Crab Pulsar's Giant Radio Pulse Amplitude Power-Law Index Using Low-Frequency Arecibo and Green Bank Telescope Observations