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Table A.3

Comparison of 22 GHz H2O maser parameters between epochs 2005.89 (S11) and 2012.54 (this work).

Epoch 2005.89a Epoch 2012.54
VLA 1 VLA 2 VLA 1 VLA 2
Number of maser features 36 88 38 68
Vlsr range (km s-1) [+8.1; +24.7] [−7.7; +14.8] [+ 9.4; +15.7] [−11.2; +22.0]
I range (Jy beam-1) [0.13;158.28] [0.09;198.45] [0.45;94.32] [0.19;26.25]
Polarizationb
Pl range (%) [0.6;25.7] [0.2;6.1] [0.6;4.5] [0.7;1.6]
PV range (%) [0.3;4.2] [0.1;3.0] [0.1;1.8] [0.4;0.7]
Intrinsic characteristics
ΔVi range (km s-1) [0.6;2.0] [0.7;3.4] [1.2;3.6] 2.0
TbΔΩ range (log K sr) [8.9;10.7] [8.6;10.7] [6.0;6.0] 8.8
⟨ ΔVi ⟩b (km s-1) <2.4
⟨ TbΔΩ ⟩b (log K sr) <6.0
Td (K) 400 2500 <2300 1600
Γ + Γν d 3 14 <13 9
Magnetic field
χ range (°) [−90; +58] [−90; +83] [−70; −25] [−48; −4]
θ range (°) [+66; +90] [+61; +90] [+90; +90] +84
ΦB range (°) [−32;0] [−7;0] [+20; +65] [+42; +86]
| B|| | range (mG) [54;809] [38;957] [18;544] [103;152]
⟨ χ ⟩e (°) −67 ± 40 −72 ± 32 −41 ± 15 −33 ± 21
⟨ θ ⟩e (°)
⟨ ΦB ⟩ (°) + 23 ± 40 + 18 ± 32 + 49 ± 15 + 57 ± 21
⟨ | B|| | ⟩f (mG) 81 ± 62 145 ± 110 >18 116 ± 35
⟨ | B | ⟩f,g (mG) 665 ± 509 1663 ± 1262 >104h 1110 ± 335
Arithmetic mean of | B|| | (mG) 264 345 281 128

Notes.

(a)

Parameters from S11.

(b)

Averaged values determined by analyzing the total full probability distribution function.

(c)

T ≈ 100·(ΔVi/ 0.5)2 is the gas temperature of the region where the H2O masers arise.

(d)

Cross-relaxation rate. The values of TbΔΩ have to be adjusted by adding +0.48 (Γ + Γν = 3), +0.95 (Γ + Γν = 9), +1.11 (Γ + Γν = 13), +1.15 (Γ + Γν = 14) as described in Anderson & Watson (1993).

(e)

Error-weighted values, where the weights are wi = 1 /ei and ei is the error of the ith measurements.

(f)

Error-weighted values, where the weights are .

(g)

| B | = ⟨ | B|| | ⟩ /cos ⟨ θ ⟩ if θ ≠ ± 90°.

(h)

We report the lower limit estimated by considering θ = 80°.

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