Table 2
NIKA Crab nebula total flux I, Q, and U, estimated by using aperture photometry methods.
| I[Jy] | Q[Jy] | U[Jy] | Ipol [Jy] | p [%] | ψeq (ψgal) [°] | |
|---|---|---|---|---|---|---|
| 5′ | 191.4 ± 26.8 | 2.97 ± 0.3 | −16.0 ± 1.5 | 16.3 ± 1.7 | 8.5 ± 0.4 | 140.3 (−82.6) ± 0.1 ± 0.5 ± 1.8* |
| 7′ | 226.5 ± 25.0 | 3.5 ± 0.4 | −14.9 ± 1.2 | 15.3 ± 1.8 | 6.7 ± 0.1 | 141.7 (−84.1) ± 0.2 ± 0.5 ± 1.8* |
| 9′ | 222.7 ± 24.6 | 3.5 ± 0.4 | −14.3 ± 1.2 | 14.8 ± 1.6 | 6.6 ± 0.3 | 142.0 (−84.3) ± 0.7 ± 0.5 ± 1.8* |
Notes. A colour correction factor of 1.05 has been taken into account. Polarized intensity flux Ipol, polarization degree p, and angles ψeq (equatorial coordinates)and ψgal (Galactic coordinates in brackets), are also presented. The values have been calculated within 5′, 7′, 9′ by aperture photometry. A total calibration error of 10 % has been accounted for. The statistical uncertainty also accounts for Monte Carlo simulations of the noise in Q and U and the differences between two sets of seven jack-knife maps. (*)A systematic angle uncertainty of 1.8° must be considered in the polarization angle error budget. We also consider a 0.5° of uncertainty due to the intensity to polarization leakage correction.
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