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Statistical properties of giant pulses from the Crab pulsar

By M. V. Popov

Abstract

; accepted Aims. The statistics of giant pulses from the Crab pulsar was studied for the first time with particular reference to their widths. Methods. About 3.5 hours of observations conducted with the Westerbork Synthesis Radio Telescope in a tied-array mode at a frequency of 1200 MHz were analyzed. The PuMa pulsar backend provided voltage recording of X and Y linear polarization states in two conjugate 10 MHz bands. Time resolution was restricted to 4µs to match the scattering on the interstellar inhomogeneities. Results. In total about 18000 giant pulses (GP) were detected in full intensity with a threshold level of 6σ. Cumulative probability distributions (CPD) of giant pulse energies were analyzed for groups of GPs with different effective widths in the range 4 to 65µs. The CPDs were found to manifest notable differences for the different GP width groups. The slope of a power-law fit to the highenergy portion of the CPDs evolves from−1.4 to−3.2 when going from the shortest to the longest GPs. There are breaks in the CPD power-law fits indicating flattening at low energies with indices varying from−0.6 to−1.6 for the short and long GPs respectively. GPs with a stronger peak flux density were found to be of shorter duration. We compare our results with previously published data and discuss the importance of these peculiarities in the statistical properties of GPs for the theoretical understanding of the emission mechanism responsible for GP generation

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