Real-Time Detection and Constraining Pulsar Emission Physics through Radio/Gamma-Ray Correlation of Crab Giant Pulses

Details Real-Time Detection and Constraining Pulsar Emission Physics through Radio/Gamma-Ray Correlation of Crab Giant Pulses Real-Time Detection and Constraining Pulsar Emission Physics through Radio/Gamma-Ray Correlation of Crab Giant Pulses

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21545304m&link_type=abstract

American Astronomical Society, AAS Meeting #215, #453.04; Bulletin of the American Astronomical Society, Vol. 42, p.463

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Giant pulses are rare, short, bright bursts of radio emission. Although giant pulses are well documented, the physical processes behind them are not well known. To determine these processes, certain properties of giant pulses need to be constrained. Among these constraints are the rate of giant pulses and the number of giant pulses as a function of intensity. Data have been taken with the 43-m telescope at Green Bank over a time span of several months and reduced in real time to search for giant pulses. We have developed a real time detection algorithm to search the data for pulses, ruling out periodic signal. When a pulse is found, the intensity vs time profile, frequency vs time plot, and raw data within a second of the burst are saved. This real time detection algorithm allows us to take a large amount of data on the Crab with minimal disk space and human intervention.
Another way we are trying to determine emission processes is by correlating Fermi data with giant pulse data from the 100-m Green Bank Telescope and the 43-m telescope. The main purpose of this is to test whether giant pulses are due to changes in the coherence of the radio emission mechanism, variations in the pair creation rate in the pulsar magnetosphere, or changes in the beaming direction. Also being tested is a specific giant pulse emission model proposed by Lyutikov, in which Crab giant pulses are generated on closed magnetic field lines near the light cylinder via anomalous cyclotron resonance of the ordinary mode. This model gives a clear prediction that radio giant pulses should be accompanied by gamma-ray photons.

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