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Table 2

All 6.7 GHz CH3OH maser features detected in NGC 7538-IRS 1 with MERLIN.

     (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12)
Maser group RAa Deca Peak flux Vlsr ΔvL Pl χ ΔVib TbΔΩb θc
offset offset Density(I)
(mas) (mas) (Jy beam-1) (km s-1) (km s-1) (%) (°) (km s-1) (log K sr) (°)

M01 D  −256  −275 22.91 ± 0.01  −60.68 0.86 7.1 ± 1.4  + 39 ± 8  <0.55d  >12d  −
M02 A  −115 47 1.70 ± 0.02  −55.94 0.45  −  −  −  −  −
M03 A  −74 22 23.53 ± 0.01  −57.30 0.36 1.3 ± 0.6  −47 ± 3
M04 C  −73  −215 51.32 ± 0.01  −61.38 0.37 1.3 ± 0.4  −42 ± 4  −  −  −
M05 C  −28  −222 50.53 ± 0.01  −60.81 0.85 0.7 ± 0.4  + 41 ± 8
M06 A 0 0 172.00 ± 0.02  −56.07 0.63 1.0 ± 0.4  + 45 ± 60  <0.95d  >12d  −
M07 B 59  −287 3.88 ± 0.01  −58.44 0.52 1.5 ± 0.9  −29 ± 7  −  −  −
M08 B 98  −186 1.11 ± 0.01  −58.70 0.54  −  −  −  −  −
M09 E 87  −559 3.54 ± 0.01  −59.05 0.31 1.6 ± 0.2  + 33 ± 6
M10 E 125  −546 1.08 ± 0.01  −58.83 0.42  −  −  −  −  −
M11 B 127  −207 24.41 ± 0.01  −57.61 0.70 0.5 ± 0.1  −23 ± 15  <0.90d  >12d  −
M12 E 154  −503 61.83 ± 0.01  −58.09 0.30 0.4 ± 0.1  + 10 ± 5
M13 B 159  −157 9.71 ± 0.02  −56.33 0.40 1.6 ± 1.3  + 18 ± 13  −  −  −

Notes. 

(a)

The absolute reference position is and δ2000 =  + 61°28′10′′.506.

(b)

The best-fitting results obtained by using a model based on the radiative transfer theory of CH3OH masers for Γ + Γν = 1s-1 (Vlemmings et al. 2010). The errors were determined by analyzing the full probability distribution function.

(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.

(d)

Because of the low angular resolution the code is able to give an upper limit for ΔVi and a lower limit for TbΔΩ.

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