Table 3
Calculated and observed column densities, as well as peak abundance radii of species detected in the CSE of IRC +10216.
| No. | Species a | Observedb | Calculatedc | Calculated d | Percentage changee | Radius of peakf | Radius of peakg |
| (This work) | (RATE12 model) | between the | abundance | emission | |||
| (cm-2) | (cm-2) | (cm-2) | two simulations | (cm & arcsec., ′′) | (cm & arcsec., ′′) | ||
|
|
|||||||
| 1 | CN | 1.1(15) | 3.5(15) | 4.1(15) | −15 | 5.0(16) & 22 | 5.4(16) & 24 |
| 2 | C 3 N | 2-4(14) | 6.7(14) | 5.1(14) | 31 | 4.0(16) & 18 | |
| 3 | C5N | 3-6(12) | 3.6(13) | 3.5(13) | 3 | 4.5(16) & 20 | 3.0(16) & 13 |
| 4 | CN − | 5.0(12) | 6.0(10) | 7.0(11) | − 91 | 7.9(16) & 35 | |
| 5 | C 3 N − | 2.0(12) | 3.2(11) | 1.0(12) | − 68 | 4.0(16) & 18 | |
| 6 | C 5 N − | 3.0(12) | 3.8(12) | 7.7(12) | − 51 | 4.5(16) & 20 | |
| 7 | HC3N | 1-2(15) | 5.4(14) | 4.8(14) | 13 | 2.5(16) & 11 | 3.8(16) & 17 |
| 8 | HC5N | 2-3(14) | 1.7(14) | 1.4(14) | 21 | 3.2(16) & 14 | |
| 9 | HC7N | 1.0(14) | 6.0(13) | 4.7(13) | 28 | 3.5(16) & 16 | |
| 10 | HC 9 N | 3.0(13) | 1.8(13) | 1.3(13) | 38 | 3.5(16) & 16 | 4.3(16) & 19 |
| 11 | PN | 1.0(13) | 2.6(09) | 5.4(09) | − 52 | 1.1(16) & 5 | |
| 12 | SiN | 4.0(13) | 3.5(11) | 2.4(12) | − 85 | 6.3(16) & 28 | |
| 13 | SiNC | 2.0(12) | 8.7(08) | 1.2(09) | −28 | 4.5(16) & 20 | |
| 14 | CH2NH | 9.0(12) | 2.8(11) | 2.4(11) | 17 | 2.8(16) & 12 | |
| 15 | CH 2 CN | 8.4(12) | 3.0(11) | 4.2(12) | − 93 | 5.6(16) & 25 | |
| 16 | CH2CHCN | 5.0(12) | 5.1(11) | 5.3(11) | −4 | 5.6(16) & 25 | |
| 17 | CH3CN | 6-30(12) | 4.9(12) | 5.6(12) | −13 | 4.0(16) & 18 | |
| 18 | C | 1.1(16) | 1.9(16) | 1.9(16) | 0 | 1.4(17) & 62 | |
| 19 | C2 | 7.9(14) | 5.2(15) | 4.2(15) | 24 | 5.0(16) & 22 | |
| 20 | C3 | 1.0(15) | 2.0(14) | 1.8(14) | 11 | 3.5(16) & 16 | |
| 21 | C 5 | 1.0(14) | 2.0(14) | 1.5(14) | 33 | 7.1(16) & 32 | |
| 22 | CP | 1.0(14) | 2.4(12) | 2.2(12) | 9 | 4.0(16) & 18 | |
| 23 | C 2 P | 1.0(12) | 1.1(09) | 8.3(09) | − 87 | 6.3(16) & 28 | |
| 24 | SiC | 6.0(13) | 1.5(13) | 1.0(13) | 50 | 7.1(16) & 32 | |
| 25 | SiC2 | 2.0(14) | 2.6(15) | 2.6(15) | 0 | 4.0(16) & 18 | 3.6(16) & 16 |
| 26 | SiC3 | 4.0(12) | 1.7(12) | 1.5(12) | 13 | 4.5(16) & 20 | |
| 27 | SiC4 | 7.0(12) | 9.6(10) | 9.5(10) | 1 | 5.6(16) & 25 | |
| 28 | H2CS | 1.0(13) | 4.7(11) | 3.8(11) | 24 | 5.6(16) & 25 | |
| 29 | C2S | 9-15(13) | 1.7(13) | 1.4(13) | 21 | 6.3(16) & 28 | |
| 30 | C3S | 6-11(13) | 1.6(13) | 1.3(13) | 23 | 4.0(16) & 18 | |
| 31 | C3O | 1.0(12) | 6.4(11) | 6.0(11) | 7 | 4.5(16) & 20 | |
| 32 | H2CO | 5.0(12) | 1.9(11) | 1.6(11) | 19 | 5.6(16) & 25 | |
| 33 | HCO+ | 3-4(12) | 1.4(12) | 1.3(12) | 8 | 5.0(16) & 22 | |
| 34 | C2H | 3-5(15) | 1.1(16) | 9.7(15) | 13 | 3.5(16) & 16 | 3.4(16) & 15 |
| 35 | C3H | 3-7(13) | 1.5(14) | 1.4(14) | 7 | 3.5(16) & 16 | 3.3(16) & 15 |
| 36 | c-C3H2 | 2.0(13) | 6.1(13) | 5.5(13) | 11 | 3.5(16) & 16 | |
| 37 | l-C3H2 | 3.0(12) | 1.3(13) | 1.1(13) | 18 | 2.5(16) & 11 | |
| 38 | CH3CCH | 1.6(13) | 1.4(12) | 1.3(12) | 8 | 2.5(16) & 11 | |
| 39 | C4H | 2-9(15) | 7.2(14) | 6.5(14) | 11 | 2.8(16) & 12 | 3.4(16) & 15 |
| 40 | C5H | 2-50(13) | 4.5(13) | 4.1(13) | 10 | 3.5(16) & 16 | |
| 41 | C6H | 7.0(13) | 7.3(14) | 5.7(14) | 28 | 4.5(16) & 20 | 3.4(16) & 15 |
| 42 | C7H | 1-2(12) | 8.2(13) | 7.3(13) | 12 | 5.6(16) & 25 | |
| 43 | C 8 H | 5.0(12) | 1.6(14) | 1.2(14) | 33 | 4.0(16) & 18 | |
| 44 | C4H− | 7.0(11) | 1.3(13) | 1.3(13) | 0 | 2.5(16) & 11 | |
| 45 | C 6 H − | 4.0(12) | 9.8(13) | 8.2(13) | 20 | 1.3(17) & 58 | |
| 46 | C8H− | 2.0(12) | 3.2(12) | 2.9(12) | 10 | 4.0(16) & 18 | |
Notes. a(b) = a × 10b. Boldface values indicate column densities showing big percentage changes (>30%) between different models, in addition to the largest and smallest radii of peak abundances. .
The compiled observational results were taken from Table 7 of McElroy et al. (2013).
Model similar to that of McElroy et al. (2013) with only a few modifications, e.g., the photodissociation rates of CN− and C3N− have been updated. These have only a small effect on the calculated column densities of species apart from CH3CCH (old vs. new, 4.9 × 1011 vs. 1.4 × 1012 cm-2) and CH2CHCN (3.6 × 1010 vs. 5.3 × 1011 cm-2).
Comparison of computational results between the SS model and the model of McElroy et al. (2013), estimated by 100 × (NThis−NRATE12)/NRATE12.
Observed radii of peak emission for a few species, estimated from their interferometric maps. Observational references are given under Fig. 13, with priority given to the newer detections.
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