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Table 1

Observed line parameters of ammonia in M 51.

Transition 1 T mb 2 V LSR 2 Δv2 rms noise N(J,K)3
(K km s-1) (mK) (km s-1) (km s-1) (mK) (cm-2)
(1, 1) 0.61 ± 0.04 4.7 460 127 1 (1.0 ± 0.1) × 1013
(2, 2) 0.27 ± 0.03 2.6 468 107 0.6 (3.4 ± 0.3) × 1012
(3, 3) 0.56 ± 0.04 4.8 462 119 1 (6.3 ± 0.5) × 1012
(4, 4) (0.16 ± 0.03)4 ... ... ... 0.6 <(1.7 ± 0.3) × 1012

Notes.

(1)

Obtained by integrating the spectra between 350−550 km s-1. The error was estimated from the noise level of each spectrum.

(2)

Obtained from Gaussian fits to the spectra.

(3)

Column density of each level.

(4)

Barely detected.

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