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Table 3

NH3 and H2O abundance comparisons.

Source N(NH3) N(H2) X(NH3) X(H2O)
(cm-2) (cm-2) (× 10-9) (× 10-9)
Sgr A complex components
+50  km s-1 cloud (1 ± 0.1) × 1016 1.6 × 1023a 63 40 a
+50  km s-1 cloud red wing ... ... ... ≥ 1000a
Molecular Belt at CND SW (4 ± 1) × 1015 <1.0 × 1023b >40 ...
Shock region at CND SW (7 ± 1) × 1014 4 × 1022c 18 1400 c
+20  km s-1 cloud ... 1 × 1023 b ... 20 a
+20  km s-1 cloud red wing ... ... ... ≥ 800 a
Galactic components
EMR (30 ± 2) × 1012 d 2.5 × 1021 e 12 ...
3-kpc Arm (11 ± 2) × 1012d 4.0 × 1021 f 3 >3 f
−30  km s-1 Arm (3 ± 1) × 1012d 1.9 × 1021f 2 30 a
Local/Sgr Arm (8 ± 5) × 1012d 6.4 × 1021f 1 >3 f

Notes.

(a)

Karlsson et al. (2013);

(b)

value for the +20  km s-1 cloud from Karlsson et al. (2013);

(c)

Karlsson et al. (2015);

(d)

mean of the respective values in Tables 1 and 2;

(e)

deduced from the 13CO(1−0) profile in Fig. 1a by Bally et al. (1988) and the conversion factor given by Sofue (1995);

(f)

Sandqvist et al. (2003).

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