Table 2.
Parameters obtained from the fitting process of the magnetar model.
| FXT | ID | z | Free/Trapped | log(κ/cm2 g−1) | log(Mej/M⊙) | log(T0/s) | log(ξ) | log(BP/G) | log(Pi/s) | χ2/d.o.f. | BIC/AIC |
|---|---|---|---|---|---|---|---|---|---|---|---|
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | (11) | (12) |
| FXTs with known redshift | |||||||||||
| 14 ( † ) | XRT 141001 | 2.23 | Trapped |
 |
 |
 |
 |
 |
 |
11.14/23 | −7.55/−15.75 |
| 16 | XRT 150322 | 0.738 | Free | – | – | – | – | 15.28 ± 0.04 |
 |
41.21/28 | 16.33/13.53 |
| 19 | XRT 170901 | 1.44 | Free | – | – | – | – |
 |
 |
43.06/39 | 9.43/6.01 |
| 22 ( † †) | XRT 210423 | 1.5105 (cNE) | Free | – | – | – | – |
 |
 |
29.03/27 | 6.77/4.03 |
| 1.04 (cW) | Free | – | – | – | – |
 |
 |
29.03/27 | 6.76/4.03 | ||
| FXTs with nominal redshift | |||||||||||
| 7 | XRT 030511 | 0.5 | Free | – | – | – | – | 15.19 ± 0.05 | −2.58 ± 0.02 | 62.97/40 | 24.49/21.01 |
| 1.0 | Free | – | – | – | – |
 |
−2.83 ± 0.02 | 62.95/40 | 24.47/21.0 | ||
| 10 | XRT 100831 | 0.5 | Free | – | – | – | – |
 |
 |
4.37/7 | −2.1/−2.5 |
| 1.0 | Free | – | – | – | – |
 |
 |
4.36/7 | −2.12/−2.52 | ||
| 12 | XRT 110919 | 0.5 | Free | – | – | – | – |
 |
−2.27 ± 0.04 | 14.71/21 | −4.0/−6.28 |
| 1.0 | Free | – | – | – | – | 15.35 ± 0.07 |
 |
14.72/21 | −4.0/−6.27 | ||
| 15 | XRT 140507 | 0.5 | Trapped | −0.66 (fix) |
 |
< 2.49 | −0.28 (fix) |
 |
 |
2.36/2 | 1.58/2.41 |
| 1.0 | Trapped | −1.0 (fix) |
 |
 |
−1.80 (fix) |
 |
 |
2.22/2 | 1.21/2.04 | ||
| 20 | XRT 191127 | 0.5 | Trapped | < 1.6 |
 |
 |
< 0.0 |
 |
 |
5.62/3 | 8.95/7.77 |
| 1.0 | Trapped |
 |
< − 1.62 |
 |
> − 3.60 |
 |
> − 3.83 | 5.19/3 | 8.22/7.04 | ||
Notes. Column 1: FXT candidate number, from Papers I and II. Column 2: ID. Column 3: redshift. Column 4: free or trapped models considered by the magnetar model. Column 5: opacity of the ejecta material. Column 6: mass of the ejecta material. Column 7: T0 parameter. Column 8: efficiency factor ξ is the fraction of the magnetar spin-down luminosity transferred to heat the ejecta material. Column 9: dipole component of the magnetic field at the poles. Column 10: initial period of the magnetar. Columns 11 and 12: Chi-square/degree-of-freedom and Bayesian/Aikake information criteria (BIC/AIC), respectively. ( † )FXTs with known photometric redshifts (Bauer et al. 2017). ( † †)Spectroscopic and photometric redshift for two of the three candidate host galaxies of XRT 210423 (Eappachen et al. 2023).
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