High Time Resolution Observations of Radio Pulsars and the First Detection of Non-Gaussian Coherent Emission

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High time resolution (100 ns) observations of several radio pulsars were made with the Caltech Baseband Recorder (CBR) at the Arecibo Radio Observatory in Puerto Rico. New analysis techniques have been developed in order to study the single pulse properties of "weak" or low-intensity pulsars. These techniques have been used to analyze the pulse-to-pulse amplitude and pulse shape variations of the fastest millisecond pulsar PSR B1937+21. Techniques have also been developed in order to search for the presence of coherent non-Gaussian emission statistics. Such statistics have been detected in pulsars B0823+26, B0950+08, and B1133+16. This is the first time such a phenomenon has been observed. These results place significant constraints on the radio pulsar emission mechanism. This work was supported in part by the National Science Foundation under grant numbers NSF COA 93-18145 and NSF AST 98-19926

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