A Low Frequency Survey of Giant Pulses from the Crab Pulsar

Abstract

We present a large survey of giant pulses from the Crab Pulsar as observed with the first station of the Long Wavelength Array. Automated methods for detecting giant pulses at low frequencies where scattering becomes prevalent are also explored. More than 1400 pulses were detected across four frequency bands between 20 - 84 MHz over a seven month period beginning in 2013, with additional followup observations in late 2014 and early 2015. A handful of these pulses were detected simultaneously across all four frequency bands. We examine pulse characteristics, including pulse broadening and power law indices for amplitude distributions. We find that the flux density increases toward shorter wavelengths, consistent with a spectral turnover at 100 MHz. Our observations uniquely span multiple scattering epochs, manifesting as a notable trend in the number of detections per observation. These results are characteristic of the variable interface between the synchrotron nebula and the surrounding interstellar medium.

To appear in the Astrophysical Journal

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• Pulsars with NenuFAR: backend and pipelines
• Probing pulsar scattering between 120 and 280 MHz with the MWA
• Detection of a Low-frequency Cosmic Radio Transient Using Two LWA Stations
• Kinematics of Crab Giant Pulses
• Narrow-band giant pulses from the Crab pulsar
• Exploration of the polarization angle variability of the Crab Nebula with POLARBEAR and its application to the search for axion-like particles
• A prototype for pulsar observations at low radio frequencies using log periodic dipole antennas
• The GRAND project and GRANDProto300 experiment
• Measurements of the Crab Pulsar's Giant Radio Pulse Amplitude Power-Law Index Using Low-Frequency Arecibo and Green Bank Telescope Observations