Table 1.
Upper limits (99% and 99.73% confidence levels) to the X-ray polarization angle (ΨX) and degree (ΠX) as calculated via the spectro-polarimetric fit for different alignment scenarios.
| T | ΨX alignment | Fixed ΨX | ΠX, 99% | ΠX, 99.73% |
|---|---|---|---|---|
| (1) | (2) | (3) | (4) | (5) |
| Full | ΨX ∥ Ψjet, 43 | −42° ≡138° | < 9.8% | < 11% |
| ΨX ⊥ Ψjet, 43 | 48° ≡ − 132° | < 7.4% | < 8.8% | |
| – | (not fixed) | < 13% | < 14% | |
| ΨX ∥ ΨO | 66.5° ≡ − 113.5° | < 10% | < 11% | |
| ΨX ⊥ ΨO | 156.5° ≡ − 23.5 | < 7.0% | < 8.4% | |
| Const. | – | (not fixed) | < 20% | < 22% |
| ΨX ∥ ΨO | 66.5° ≡ − 113.5° | < 8.1% | < 9.9% | |
| ΨX ⊥ ΨO | 156.5° ≡ − 23.5 | < 17% | < 19% | |
| Peak | – | (not fixed) | < 13% | < 15% |
| ΨX ∥ ΨO | 66.5° ≡ − 113.5° | < 12% | < 14% | |
| ΨX ⊥ ΨO | 156.5° ≡ − 23.5 | < 11% | < 13% | |
Notes. Columns: (1) time interval used in the spectro-polarimetric analysis; (2) alignment used to fix the value of the X-ray polarization angle (ΨX); (3) fixed value of ΨX; (4) upper limit to X-ray polarization degree at 99% confidence level; (5) upper limit to X-ray polarization degree at 99.73% confidence level (i.e., Gaussian 3σ). “Full” refers to the entire IXPE observing period (MJD 60089-60098); “Const.” refers to the constant ΨO period (MJD 60092-60095), and “Peak” refers to the period in which the IXPE flux peaked (MJD 60094-60096; see Fig. 1). In column (3), the symbol “≡” is used to represent the inherent ±180° ambiguity in the polarization angles.
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