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Table 1

All 22 GHz H2O maser features detected in NGC 7538-IRS 1.

     (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13)
Maser Group RA Dec Peak flux Vlsr ΔvL Pl χ TbΔΩa θc
offset offset Density(I)
(mas) (mas) (Jy beam-1) (km s-1) (km s-1) (%) (°) (km s-1) (log K sr) (%) (°)

W01 N  −185.2131 141.908 17.11 ± 0.07  −57.8 0.41  −  −  −  −  −  −
W02 N  −176.4676 139.422 1.00 ± 0.02  −58.3 0.32  −  −  −  −  −  −
W03 N  −170.9744 139.088 0.48 ± 0.02  −58.3 0.27  −  −  −  −  −  −
W04 S  −57.6929  −1071.104 0.90 ± 0.01  −72.2 0.59  −  −  −  −  −  −
W05 S  −57.4470  −1056.554 0.48 ± 0.01  −57.3 0.47  −  −  −  −  −  −
W06 S  −57.3376  −1056.630 36.43 ± 0.02  −70.3 1.15 1.2 ± 0.1  −13.0 ± 1.3  −  −  −  −
W07 S  −57.1463  −1057.065 16.99 ± 0.01  −73.3 0.77 1.2 ± 0.1  −10.8 ± 0.5 0.37 ± 0.13
W08 S  −56.7637  −1056.586 0.15 ± 0.01  −67.3 1.46  −  −  −  −  −  −
W09 S  −56.4631  −1070.080 0.48 ± 0.01  −71.6 0.64  −  −  −  −  −  −
W10 N 0 0 7.34 ± 0.03  −60.6 0.56  −  −  −  −  −  −
W11 N 85.5692  −96.002 0.36 ± 0.02  −59.7 0.44  −  −  −  −  −  −
W12 N 110.0019  −13.538 0.20 ± 0.03  −60.2 0.83  −  −  −  −  −  −
W13 N 111.6690  −99.499 9.31 ± 0.03  −60.1 0.47  −  −  −  −  −  −
W14 N 112.8442  −156.492 0.25 ± 0.03  −60.1 0.42  −  −  −  −  −  −
W15 N 151.9803  −90.046 1.04 ± 0.03  −59.9 0.40  −  −  −  −  −  −
W16 N 242.0042 148.947 0.13 ± 0.01  −43.3 0.62  −  −  −  −  −  −
W17 N 242.7694 149.715 0.14 ± 0.01  −43.8 0.59  −  −  −  −  −  −

Notes. 

(a)

The best-fitting results obtained by using a model based on the radiative transfer theory of H2O masers for Γ + Γν = 1s-1 (Surcis et al. 2011). The errors were determined by analyzing the full probability distribution function.

(b)

The percentage of circular polarization is given by PV = (Vmax − Vmin)/Imax.

(c)

The angle between the magnetic field and the maser propagation direction is determined by using the observed Pl and the fitted emerging brightness temperature. The errors were determined by analyzing the full probability distribution function.

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