Table 2.
The 14 known pulsars in NGC 1851 and their main characteristics.
| Summary of the pulsars known in NGC 1851 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Pulsar | Type | P | DM | Pb | xp | e |
 |
αJ2000 | δJ2000 | ⟨SUHF⟩ | RM |
| (ms) | (pc cm−3) | (d) | (lt-s) | (M⊙) | (μJy) | (rad m−2) | |||||
| A | Binary | 4.9906 | 52.1402(4) | 18.785 | 36.290 | 0.888 | 0.9 | 05h14m06 6927(2) |
 |
241(115) | −12(4) |
| B | Isolated | 2.8163 | 52.076(3) | – | – | – | – | 05h14m06 73(8) |
 |
82(40) | −13(4) |
| C | Isolated | 5.5648 | 52.053(5) | – | – | – | – | 05h14m06 69(4) |
 |
76(31) | −8(5) |
| D | Binary | 4.5544 | 52.219(5) | 5.686 | 9.800 | 0.862 | 0.48 | 05h14m06 73(5) |
 |
117(57) | −12(4) |
| E | Binary | 5.5959 | 51.930(3) | 7.448 | 27.826 | 0.708 | 1.53 | 05h14m06 68(6) |
 |
65(17) | −6(4) |
| F | Binary | 4.3294 | 51.620(9) | 4.313 | 4.073 | 0 | 0.22 | 05h14m06 7(1) |
 |
26(14) | – |
| G | Binary | 3.8028 | 50.959(3) | 2.636 | 1.997 | 0 | 0.14 | 05h14m06 63(5) |
 |
99(23) | −12(3) |
| H | Binary | 5.5061 | 52.226(6) | 16.944 | 12.805 | 0.020 | 0.28 | 05h14m06 6(1) |
−40° 02′48″(1) | 32(18) | −11(6) |
| I | Binary | 32.6542 | 52.58(3) | 0.985 | 1.090 | 0.0098 | 0.15 | 05h14m06 75(7) |
 |
30(7) | – |
| J | Isolated | 6.6329 | 52.017(7) | – | – | – | – | 05h14m06 7(2) |
−40° 02′48″(2) | 26(17) | −14(6) |
| K | Isolated | 4.6920 | 51.928(2) | – | – | – | – | 05h14m06 8(2) |
−40° 02′48″(2) | 29(5) | −13(6) |
| L | Binary | 2.9588 | 51.245(3) | 1.141 | 1.326 | 0 | 0.17 | 05h14m06 8(1) |
 |
35(10) | – |
| M | Isolated | 4.7978 | 51.678(14) | – | – | – | – | 05h14m06 76 ( ‡ ) |
 |
26(17) | −13(5) |
| N | Isolated | 5.5679 | 51.068(4) | – | – | – | – | 05h14m06 7(1) |
−40° 02′47″(1) | 31(6) | – |
Notes. Pulsar A is the only previously known pulsar and its quoted parameters, except ⟨SUHF⟩ and RM, are taken from Ridolfi et al. (2019). All the other pulsars are new discoveries presented in this work. P: barycentric spin period; DM: dispersion measure; Pb: orbital period; xp: projected semi-major axis of the pulsar orbit; e: eccentricity; 
: minimum companion mass as derived from the mass function, assuming a pulsar mass of Mp = 1.4 M⊙; αJ2000, δJ2000: maximum-likelihood right ascension and declination derived with SeeKAT (see Sect. 2.7); ⟨SUHF⟩: average mean flux density in the MeerKAT UHF band (see Sect. 2.5); RM: rotation measure. The quoted uncertainties on the DMs are the standard error on the average of all the sample measurements, whereas the uncertainties on ⟨SUHF⟩ are the standard deviations of all the measurements. The uncertainties on the RMs are those reported by rmfit, as described in Sect. 2.6. The uncertainties on αJ2000, δJ2000 are derived from the 1-σ contours returned by SeeKAT. ( ‡ )Localization of pulsar M with SeeKAT was not possible due to the faintness and scarcity of its detections. Therefore, the reported coordinates are those of the central beam of the TRAPUM tilings, where pulsar M is always detected with highest S/N.
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