Table 1.
Compendium of the sub-millimetre Crab nebula polarisation angle measurements in Galactic coordinates for WMAP (Weiland et al. 2011), XPOL (Aumont et al. 2010), Planck-LFI (Planck Collaboration XXVI 2016), and Planck-HFI and NIKA (Ritacco et al. 2018).
| Experiment | ν (GHz) | Beam | ψGal (deg) | Statistical | Systematic  (deg) |
||
|---|---|---|---|---|---|---|---|
| size |  (deg) |
Ground | EB | TB | |||
| WMAP | 23 | 53′ | −88.5 | 0.1 | 1.5 | − | − |
| 33 | 40′ | −87.7 | 0.1 | 1.5 | − | − | |
| 41 | 31′ | −87.3 | 0.2 | 1.5 | − | − | |
| 61 | 21′ | −87.7 | 0.4 | 1.5 | − | − | |
| 94 | 13′ | −88.7 | 0.7 | 1.5 | − | − | |
| XPOL | 90 | 27″ | −88.8 ( ⋆ ) | 0.2 | 0.5 | − | − |
| Planck-LFI | 30 | 33′ | −89.26 | 0.25 | 0.5 | − | − |
| 44 | 27′ | −88.65 | 0.79 | 0.5 | − | − | |
| 70 | 13′ | −87.49 | 1.33 | 0.5 | − | − | |
| Planck-HFI | 100 | 10′ | −87.52 | 0.16 | 1.00 | 0.49 | 0.21 |
| 143 | 7′ | −86.61 | 0.21 | 1.00 | 0.32 | 0.19 | |
| 217 | 5′ | −87.93 | 0.25 | 1.00 | 0.36 | 0.62 | |
| 353 | 5′ | −86.76 | 0.52 | 1.00 | − | − | |
| NIKA | 150 | 18″ | −84.3 ( • ) | 0.7 | 2.3 | − | − |
Notes. In the case of Planck-HFI, the so-called ground systematic uncertainties come from Rosset et al. (2010). The systematic uncertainties called EB and TB are derived from the 
and 
minimisation presented in Planck Collaboration Int. XLVI (2016).
( ⋆ )Convolved with a 10′ Gaussian.
( • )Computed with aperture photometry techniques within 9′.
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