Table 1.
List of the MeerKAT observations of NGC 1851 recorded for this work.
| Obs. id | Start time | Start time | Length | Backend | tsamp | Npol | fc | Δf | Nchan | Nant | Nbeam |
|---|---|---|---|---|---|---|---|---|---|---|---|
| (date) | (MJD) | (s) | (μs) | (MHz) | (MHz) | ||||||
| 01L | 15 Jan. 2021 | 59229.626 | 14 400 | APSUSE | 76.56 | 1 | 1284 | 856 | 4096 | 64 | 288 |
| 02L | 08 May 2021 | 59342.278 | 7200 | APSUSE | 76.56 | 1 | 1284 | 856 | 4096 | 60 | 288 |
| 03L | 08 May 2021 | 59342.586 | 7200 | APSUSE | 76.56 | 1 | 1284 | 856 | 4096 | 60 | 288 |
| 04U | 21 May 2021 | 59355.253 | 7200 | APSUSE | 60.24 | 1 | 816 | 544 | 4096 | 56 | 277 |
| 05U | 21 May 2021 | 59355.628 | 7200 | APSUSE | 60.24 | 1 | 816 | 544 | 4096 | 60 | 277 |
| 06U | 24 May 2021 | 59358.242 | 7200 | APSUSE | 60.24 | 1 | 816 | 544 | 4096 | 56 | 277 |
| 07U | 26 May 2021 | 59360.607 | 7200 | APSUSE | 60.24 | 1 | 816 | 544 | 4096 | 56 | 277 |
| 08U | 03 Jul. 2021 | 59398.485 | 7200 | PTUSE | 9.41 | 4 | 816 | 544 | 1024 | 61 | 1 |
| 09U | 17 Aug. 2021 | 59443.233 | 7200 | PTUSE | 9.41 | 4 | 816 | 544 | 1024 | 59 | 1 |
| 10U | 01 Sep. 2021 | 59458.067 | 7200 | PTUSE | 9.41 | 4 | 816 | 544 | 1024 | 57 | 1 |
| 11U | 30 Sep. 2021 | 59487.942 | 7200 | PTUSE | 9.41 | 4 | 816 | 544 | 1024 | 61 | 1 |
| 12U | 07 Nov. 2021 | 59525.075 | 10800 | PTUSE | 9.41 | 4 | 816 | 544 | 1024 | 61 | 1 |
| 13U | 09 Nov. 2021 | 59527.919 | 7200 | PTUSE | 9.41 | 4 | 816 | 544 | 1024 | 56 | 1 |
Notes. All PTUSE data were acquired with real-time coherent de-dispersion, using a DM of 52.1 pc cm−3. The subsequent symbols stand for the following: tsamp, sampling time; Npol, number of Stokes parameters; fc, central frequency; Δf, observing bandwidth; Nchan, number of frequency channels; Nant, number of antennas; and Nbeam, number of tied-array beams. Before being searched for new pulsars, all of the APSUSE observations were incoherently de-dispersed at a DM of 52.14 pc cm−3 and subbanded, resulting in 256-channel filterbank files. On the other hand, all of the PTUSE observations were summed in polarization and decimated in both time and frequency, retaining total intensity information, 512 frequency channels, and a time resolution of 75.29 μs (see Sect. 2.2). The native-resolution full-Stokes PTUSE data were used for polarimetric measurements (see Sect. 2.6).
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