Sifting for Fast Radio Transients in Pulsar Survey Data Using the Spectral Modulation Index

Details Sifting for Fast Radio Transients in Pulsar Survey Data Using the Spectral Modulation Index Sifting for Fast Radio Transients in Pulsar Survey Data Using the Spectral Modulation Index

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21923709s&link_type=abstract

American Astronomical Society, AAS Meeting #219, #237.09

Astronomy and Astrophysics

Astronomy

Scientific paper

Large-scale surveys for fast radio transients apply single-pulse search algorithms to high time resolution spectral data (i.e. those typical of pulsar surveys). Such surveys are often plagued by radio frequency interference (RFI), which when not properly mitigated, can confuse detection pipelines and lead to a large number of false candidates. We have developed a method to classify a candidate signal based on the modulation of its spectrum using the spectral modulation index. In brief, broadband and narrowband signals have low and high modulation indices respectively, and by choosing a modulation index cutoff, a spectrum can be automatically classified as either broad or narrowband. Our method targets broadband (continuum) transients that have have a non-zero dispersion measure, while RFI is generally broadband at low dispersion measures or narrowband. We show that the spectral modulation index is a powerful tool for identifying RFI and demonstrate the technique with Crab giant pulses and Rotating Radio Transients (RRATs). We also apply it to data taken for the Pulsar ALFA (PALFA) survey being conducted at the Arecibo Observatory and show preliminary results with an emphasis on the data collected with the new Mock spectrometers.

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