A Parkes “Murriyang” Search for Pulsars and Fast Transients in the Large Magellanic Cloud

Author:

Hisano ShinnosukeORCID,Crawford FronefieldORCID,Bonidie Victoria,Alam Md F.,Takahashi KeitaroORCID,Lorimer Duncan R.ORCID,Ridley Josh P.ORCID,McLaughlin Maura M.ORCID,Perera Benetge B. P.ORCID

Abstract

Abstract We report on the latest results of a Parkes multibeam survey for pulsars and dispersed radio bursts in the Large Magellanic Cloud (LMC). We conducted both periodicity and single-pulse searches at a much larger range of trial dispersion measures (DMs) than previously searched. We detected 229 single pulses with signal-to-noise ratio (S/N) > 7 that were classified by the deep-learning network FETCH as being real (with >90% likelihood), of which nine were from the known giant-pulse-emitting pulsar PSR B0540−69. Two possibly repeating sources were detected with DMs suggesting that they lie within the LMC, but these require confirmation. Only three of the 220 unknown pulses had S/N > 8, and the DM distribution for these detected pulses follows an exponential falloff with increasing DM and does not show any excess of signals at DM values expected for the LMC. These features suggest that the detected pulses are not likely to be real, although they are visually compelling. We also report the discovery of a new pulsar (PSR J0556−67) in our periodicity search. This pulsar has a spin period of 791 ms, a DM of 71 cm−3 pc, an estimated 1400 MHz flux density of ∼0.12 mJy, and shows no evidence of binary motion. Future observations may be able to confirm whether any of the weak but promising candidates in our single-pulse and periodicity searches, including our two possible repeaters, are real or not.

Funder

MEXT ∣ Japan Society for the Promotion of Science

ISM Cooperative Research Program

Publisher

American Astronomical Society

Subject

Space and Planetary Science,Astronomy and Astrophysics

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