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Pulsars are the only cosmic radio sources known to be sufficiently compact toshow diffractive interstellar scintillations. Images of the variance of radiosignals in both time and frequency can be used to detect pulsars in large-scalecontinuum surveys using the next generation of synthesis radio telescopes. Thistechnique allows a search over the full field of view while avoiding the needfor expensive pixel-by-pixel high time resolution searches. We investigate thesensitivity of detecting pulsars in variance images. We show that varianceimages are most sensitive to pulsars whose scintillation time-scales andbandwidths are close to the subintegration time and channel bandwidth.Therefore, in order to maximise the detection of pulsars for a given radiocontinuum survey, it is essential to retain a high time and frequencyresolution, allowing us to make variance images sensitive to pulsars withdifferent scintillation properties. We demonstrate the technique withMurchision Widefield Array data and show that variance images can indeed leadto the detection of pulsars by distinguishing them from other radio sources.

Detecting Pulsars with Interstellar Scintillation in Variance Images