Table 3
Column densities toward the four analyzed subregions of W49A (in case of detections) derived in the LTE optically thin approximation.
| Species | Transition | Column density (cm-2) | ||||
| Center | Eastern tail | Northern clump | Southwest clump | |||
|
|
||||||
| C2H | 49/2–37/2 | (1.7−2.8) × 1015 | (3.8−6.0) × 1014 | (5.7−9.0) × 1014 | (5.2−8.3) × 1014 | |
| NO | 7/2–5/2+ | (1.0−1.8) × 1017 | (0.8−1.4) × 1016 | (1.0−1.9) × 1016 | (4.8−8.8) × 1015 | |
| H13CN | 4–3 | (1.0−1.4) × 1014 | (6.5−9.8) × 1011 | (2.0−3.0) × 1012 | (1.6−2.5) × 1012 | |
| H13CO+ | 4–3 | (2.5−3.8) × 1013 | (0.8−1.3) × 1012 | (1.3−2.0) × 1012 | (1.3−1.9) × 1012 | |
| CN | N = 3–2, J = 5/2–3/2 | (1.4−2.2) × 1015 | (3.0−4.8) × 1014 | (4.3−6.9) × 1014 | (3.7−5.9) × 1014 | |
| N2H+ | 4–3 | (3.0−4.4) × 1013 | (0.7−1.1) × 1013 | (4.1−6.0) × 1012 | (1.4−2.0) × 1012 | |
| CS | 7–6 | (4.4−5.6) × 1014 | (4.7−6.1) × 1013 | (7.5−9.6) × 1013 | (4.8−6.2) × 1013 | |
| C34S | 7–6 | (6.2−8.8) × 1013 | (2.2−2.8) × 1012 a | (4.2−6.1) × 1012 | (5.8−8.3) × 1011 | |
| H2S | 32,1–31,2 | 4.9 × 1015 | ||||
| HCO | 41,4–31,3 | (1.4−2.4) × 1015 | ||||
| CO+ | N = 3–2, F = 5/2–3/2 | (1.4−2.2) × 1013 | ||||
| HCS+ | 8–7 | (1.8−2.2) × 1013 | ||||
| SO+ | 8–7 | (4.4−5.7) × 1014 | ||||
| H3O+ | 32,1–22,0 | (4.8−5.3) × 1014 | ||||
| SiO | 8–7 | (0.8−1.0) × 1014 | ||||
Notes. The two values correspond to adopted temperatures of 75 K and 150 K, respectively. The error of these column densities is about a factor of 2 dominated by the uncertainty in Tex.
Based on N(CS) and an isotopic ratio of 32S/34S of 22 (Frerking et al. 1980).
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