102.100.100/608495 https://data.csiro.au/dap/ 102.100.100/608495 10.25919/yz9g-tz69 Parkes observations for project P1168 semester 2023OCTS_04

http://hdl.handle.net/102.100.100/608495

2023-10-01 2024-03-31 10.25919/yz9g-tz69 v1 Commonwealth Scientific and Industrial Research Organisation (CSIRO) DeCesar Megan Ransom Scott Kerr Matthew Dai Shi 2024-02-08 csiro:8646fb4d-2fd4-4b9b-a2cc-b3eabf3cfa1d csiro:PartyGroup pulsars neutron stars stellar systems (incl. brown dwarfs) 510199 We discovered seven pulsars in the globular cluster Terzan 1 with the Green Bank Telescope (GBT), the first pulsars to be found in this cluster. The discoveries include five fully-recycled millisecond pulsars (MSPs) with spin periods between 3 and 6 ms, an 11-ms MSP, and a pulsar with an unusually long spin period of 134 ms. Our preliminary timing suggested that all seven are likely isolated pulsars, consistent with Terzan 1 being a core-collapsed globular cluster. The 134-ms pulsar is an especially interesting discovery in the context of pulsar formation via electron-capture rather than core-collapse supernovae. In 2022OCT we observed Terzan 1 with Parkes three times and confirmed that all pulsars could be detected. We began a year-long timing campaign in the present semester, 2023APR, and were granted continuing status for that campaign. We request to continue timing these pulsars through 2023OCT. To refine the timing parameters and probe the pulsars' acceleration in the cluster potential, we will extend phase connection beyond one year using the 2022OCT observations, and we will attempt to phase connect back to the original GBT discovery pointings. In addition to timing, we will probe the pulsars' polarization properties and the Galactic magnetic field in the direction of Terzan 1; and the proposed observations will also be searched for new pulsars that may have been missed in previous observations. All Rights (including copyright) CSIRO 2023. Creative Commons Attribution Data is accessible online and may be reused in accordance with licence conditions