A search for dispersed radio bursts in archival Parkes Multibeam Pulsar Survey data

TL;DR

This study analyzed archival data from the Parkes Multibeam Pulsar Survey to search for dispersed radio bursts, finding four peryton-like events but no new astrophysical transient signals, thus constraining the nature of such phenomena.

Contribution

The paper presents a systematic search for dispersed radio bursts in archival data, identifying four new peryton-like events and providing evidence against a cosmological origin for the Lorimer burst.

Findings

No new Rotating Radio Transients or Lorimer burst-like events detected.

Four peryton-like events discovered, not linked to atmospheric phenomena.

Results suggest the Lorimer burst is unlikely to be from a cosmological source.

Abstract

A number of different classes of potentially extra-terrestrial bursts of radio emission have been observed in surveys with the Parkes 64m radio telescope, including "Rotating Radio Transients", the "Lorimer burst" and "perytons". Rotating Radio Transients are radio pulsars which are best detectable in single-pulse searches. The Lorimer burst is a highly dispersed isolated radio burst with properties suggestive of extragalactic origin. Perytons share the frequency-swept nature of the Rotating Radio Transients and Lorimer burst, but unlike these events appear in all thirteen beams of the Parkes Multibeam receiver and are probably a form of peculiar radio frequency interference. In order to constrain these and other radio source populations further, we searched the archival Parkes Multibeam Pulsar Survey data for events similar to any of these. We did not find any new Rotating Radio Transients or bursts like the Lorimer burst. We did, however, discover four peryton-like events. Similar to the perytons, these four bursts are highly dispersed, detected in all thirteen beams of the Parkes multibeam receiver, and have pulse widths between 20--30 ms. Unlike perytons, these bursts are not associated with atmospheric events like rain or lightning. These facts may indicate that lightning was not responsible for the peryton phenomenon. Moreover, the lack of highly dispersed celestial signals is the evidence that the Lorimer burst is unlikely to belong to a cosmological source population.