New extragalactic pulsars in archival data

We have conducted a reprocessing of the Magellanic Clouds survey conducted approximately 20 years ago (Manchester et al. 2006) using the Parkes radio telescope. The initial survey discovered 11 pulsars in the Large Magellanic Cloud (LMC) and 3 in the Small Magellanic Cloud (SMC). Subsequent reprocessing by Ridley et al. (2013) of these archival datasets discovered an additional 5 pulsars in the LMC.

Building on these efforts, we have now reprocessed the survey using more sensitive search techniques based on Sengar et al. (2023, 2025). Our reprocessing has identified 7 new potential pulsars in LMC. Of these, 3 have already been confirmed while the remaining candidates await confirmation. Below are their basic parameters.

Pulsar
JName
RA Dec Period (s) DM (pc cm−3) Confirmed(?) Notes
1 J0547-6812 05:47:46 -68:12:09 0.1734274 388 Not yet Awaiting Parkes observation
2 J0547-6812 05:47:46 -68:12:09 0.5738093 70 Not yet Awaiting Parkes observation
3 J0553-7111 05:53:56 -71:11:16 0.4849740 348 Not yet Awaiting Parkes observation
4 J0543-6737 05:43:10 -67:37:46 0.6483595 73 -- Nulling Pulsar
5 J0554-6740 05:54:49 -67:40:36 0.7001685 170 Not yet Awaiting Parkes observation
6 J0541-6829 05:41:40 -68:29:24 0.9531718 161 Yes Confirmed with Parkes UWL receiver
7 J0520-6747 05:20:58 -67:47:27 3.8526525 150 Yes Confirmed in neighboring pointing (slowest extragalactic pulsar!)