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Table 2

Parameters of the NH3  maser lines observed toward W51-north.

Line Fpeak Vc ΔV1/2 Fint Tb
(J,K) (Jy) (km s-1) (km s-1) (Jy km s-1) (104 K)

(6, 6) 4.88 47.6 1.4 7.08 17.2
(7, 7) 0.20 47.1 1.2 0.26 0.7
0.17 49.7 1.0 0.19 0.6
(9, 9) 0.35 47.4 1.5 0.52 1.0

Notes. The peak fluxes (Fpeak, Col. 2), the central velocities (Vc; Col. 3), the FWHM line-width (ΔV1/2; Col. 4), and the velocity-integrated flux (Fint; Col. 5) are estimated from single-Gaussian fits to the spectral profiles in Fig. 3. The brightness temperatures Tb are estimated using a beamsize of 0.̋25 (upper limit to the unresolved maser size), and should be regarded as lower limits. The velocities reported here (and throughout the paper) are local standard of rest velocities.

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