Giant Pulses from the Crab Pulsar: A Joint Radio and Gamma-ray Study

Details Giant Pulses from the Crab Pulsar: A Joint Radio and Gamma-ray Study Giant Pulses from the Crab Pulsar: A Joint Radio and Gamma-ray Study

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.9906l&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #99.06; Bulletin of the American Astronomical Society, Vol. 24, p.1276

Astronomy and Astrophysics

Astronomy

Scientific paper

We report analysis of joint radio and gamma-ray observations of giant radio pulses from the Crab pulsar. These bursts can be as much as 5000 times the average flux in the radio. During our two weeks of 800 MHz observations at the Green Bank 43 m telescope, we detected on average over 200 giant pulses per hour for a total of 30000 giant pulses. Correlating radio and gamma-ray emission constrains the radio coherence mechanism and the steadiness of electron-positron outflow in the magnetosphere. We have found an upper limit on gamma-ray flux variation concurrent with the giant radio bursts. Our analysis of the radio data includes calculation of histograms of pulse intensities, absolute timing to about 20 mu s precision, and characterization of intensity variations on time scales from the 33 ms spin period to days. We consider the possibility of correlations between arrival times, rates, widths, and energies of giant pulses in order to constrain theoretical models for giant pulse emission mechanisms. In particular, arrival time and width jitter implies changes in the size and location of the emission region. Long-term apparent changes in the rate and energy of the giant pulses are caused both by propagation effects in the interstellar medium and intrinsic variability of the effectiveness of the coherence mechanism. We have disentangled these two effects to determine the relative importance of each.

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