Table 4.
Data reduction, model fit, spin, DM, and astrometric parameters from the DDH TEMPO2/TempoNEST fits.
| Data set | Global | Multibeam | MeerKAT+UWL |
|---|---|---|---|
| Data reduction parameters | |||
| Number of ToAs | 1545 | 365 | 1180 |
| First ToA (MJD) | 55 987.54 | 55 987.54 | 58 526.27 |
| Last ToA (MJD) | 60 101.30 | 58 581.61 | 60 101.30 |
| Solar System ephemeris | DE430 | DE430 | DE430 |
| Timescale | TCB | TCB | TCB |
| Shortest correlated spin noise timescale, νspin−1 (days) | 100 | 100 | 100 |
| Shortest correlated DM noise timescale, νDM−1 (days) | 50 | 50 | 50 |
| Model fit paramaters | |||
| Log correlated spin noise amplitude, log Aspin (μs) | −11.7524 | −12.0384 | −11.8007 |
| Log correlated DM noise amplitude, log ADM (μs) | −10.0075 | −11.7218 | −9.993 |
| Spin noise spectral index, γspin (μs) | 1.49911 | 0.281109 | 1.0046 |
| DM noise spectral index, γDM (μs) | 1.57333 | −1.80875 | 1.45055 |
| Weighted root mean square of the timing residuals (μs) | 6.995 | 23.571 | 6.094 |
| Reduced χ2 | 0.9650 | 1.0298 | 0.9643 |
| Spin and astrometric parameters | |||
| Reference epoch for spin, position, and DM (MJD) | 55 991.22 | 55 991.22 | 58 526 |
| Right ascension, RA (J2000, hh:mm:ss) | 12:27:00.4414(4) | 12:27:00.4412(4) | 12:27:00.441(2) |
| Declination, DEC (J2000, dd:mm:ss) | −62:08:43.791(3) | −62:08:43.788(2) | −62:08:43.80(1) |
| Proper motion in RA (μRA, mas yr−1) | −6.1(3) | −5.2(7) | −5.9 ± 1.1 |
| Proper motion in DEC (μDEC, mas yr−1) | 0.41 ± 0.36 | −0.4(7) | 1.4 ± 1.2 |
| Spin frequency, F0 (Hz) | 28.962140551274(9) | 28.96214055129(2) | 28.96214051691(1) |
| Spin frequency derivative, F1 (10−16 Hz s−1) | −1.5677(4) | −1.570(2) | −1.5636(14) |
| Dispersion measure, DM0 (pc cm−3) | 362.816(12) | 362.808(11) | 362.895(7) |
| First derivative of DM, DM1 (10−2 pc cm−3 yr−1) | 1.72(5) | 2.8(9) | −1.86(9) |
| Second derivative of DM, DM2 (10−3 pc cm−3 yr−2) | −2.3(9) | −3.1 ± 2.1 | 3.1 ± 2.1 |
| Derived parameters | |||
| Galactic longitude, l (deg) | 300.082 | ... | ... |
| Galactic latitude, b (deg) | 0.591 | ... | ... |
| Spin period, Ps (ms) | 34.527834647774(10) | 34.52783464775(2) | 34.527834688742(19) |
| Spin period derivative, Ṗs (10−19 s s−1) | 1.8690(5) | 1.872(3) | 1.8640(17) |
| NE2001 DM-derived distance, d (kpc) | 8.3 | ... | ... |
| YMW16 DM-derived distance, d (kpc) | 8.5 | ... | ... |
| Shklovskii contribution to Ṗs (10−19 s s−1) | ∼0.26 | ... | ... |
| Galactic potential contribution to Ṗs (10−19 s s−1) | ∼(−0.26) | ... | ... |
| Characteristic age, τc (Gyr) | 2.9 | ... | ... |
| Spin-down luminosity, |Ė| (erg s−1) | 6.3 × 1032 | ... | ... |
| Surface magnetic field strength, Bsurf (G) | 2.6 × 109 | ... | ... |
Notes. The derived parameters are derived only for the global fit, the most constraining solution, and left blank for the multibeam and MeerKAT+UWL fit. The value of Ṗs has not been corrected for the possible Shklovskii and Galactic potential contributions.
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