Table 11
Molecular abundance comparisons.
| Source | Region | X(OH) | X(o-H2O) | X(o-NH3) |
| (Absorption feature) | (×10-6) | (×10-9) | (×10-9) | |
|
|
||||
| Sgr Aa | +50 km s-1 cloud | 8 | 40 | − |
| +50 km s-1 cloud red wing | − | 1000§ | − | |
| CND | 35 | 70 | − | |
| CND red wing | − | 5700§ | − | |
| +20 km s-1 cloud | 13 | 20 | − | |
| +20 km s-1 cloud red wing | − | 800§ | − | |
| Local/Sgr arm | 2 | − | 3 | |
| −30 km s-1 arm | 6 | 30 | 5 | |
| 3-kpc arm | 4 | − | 3 | |
|
|
||||
| Sgr B2 | cloud envelope | 2−5b | 100cd | ≈7ce |
| EMR | − | − | 12c | |
| 3-kpc arm | − | 20−400 cf | 7 c | |
|
|
||||
| G10.06−0.4 | foreground clouds | − | − | 2(0.5−7)g |
|
|
||||
| W49N | spiral arm clouds | 0.2 & 1h | 80−400i | 2(1−7)j |
|
|
||||
| Orion KL | PDR interface | − | ≥110kl | − |
| PDR bar | − | − | 5m | |
| Compact ridge | − | 2800l | 200l | |
| Hot core | − | 12 000l | 1600l | |
| Low vel. outflow | 1n | 2900l | − | |
| High vel. outflow | − | 22 000l | − | |
|
|
||||
| rho Oph A | core | − | 5o | 0.4p |
|
|
||||
| IRAS 16293 | core | − | 2q | − |
Notes.
Beam-averaged, lower abundance limit, since the comparison H2 column density very likely is overestimated (see Sect. 4.7.).
From this paper, Table 10; absorption features observed by VLA and Odin.
Odin results; Wirström et al. (2010).
From simultaneous Accelerated Lambda Iteration (ALI) modelling of H2O, H
O, and H
O absorption lines.
From 15NH3 and assuming N(H2) = 1.5 × 1024 cm-2 (cf. Nummelin et al. 2000, Sect. 5.1.1).
Herschel absorption lines, Persson et al. ( 2010, 2012), average value and range of multi-velocity-component fits.
Arecibo data; Plume et al. (2004).
SWAS data; Plume et al. (2004), lower/upper limits from H2O absorption/invisible HO absorption.
Herschel absorption lines; Persson et al. (2012), average value and range of multi-velocity-component fits.
Odin results; Wirström et al. (2006).
Odin spectral line survey; Persson et al. (2007).
Odin result; Larsson et al. (2003).
SWAS result from Monte Carlo modelling; Ashby et al. (2000).
Odin result; Liseau et al. (2003).
Odin result from ALI modelling; Hjalmarson et al. (2003).
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