Direct observation of pulsar microstructure at timescales down to 6 microseconds

Astronomy and Astrophysics – Astronomy

Scientific paper

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21

Electromagnetic Pulses, Fine Structure, Pulsars, Radio Astronomy, Autocorrelation, Bandwidth, Cross Correlation, Magnetic Flux, Radiant Flux Density, Time Lag

Scientific paper

Pulsed radio emission from PSR 1133+16 was sampled in two channels of different frequencies at data rates up to 1 MHz. The occurrence of individual pulses delayed in time corresponding to the dispersion delay of the interstellar medium demonstrates the existence of microstructure at about 2700 MHz on time scales down to 6 microsec and fluxes of up to 500 Jy, correlated over a 20-MHz bandwidth. This is the fastest modulation yet published. The results are discussed in terms of the relativistic beaming model.

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