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Table 4
Total column densities of various species along the SW and NE lines of sight toward PKS 1830−211.
| Species | Observation year | Column densities (cm-2) | γ SW/NE | f H2 | |
| SW | NE | ||||
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| H I | 1996–2015a | 1.3 × 1021 | 2.5 × 1021 | 0.5 | ~1–>50% |
| ArH+ | 2015b | 2.7 × 1013 | 1.3 × 1013 | 2.1 | 10-5−10-2 j |
| OH+ | 2015c | 1.6 × 1015 | 7.6 × 1014 | 2.2 | a few % |
| H2Cl+ | 2012d | 1.4 × 1013 | 3.7 × 1012 | 3.8 | |
| H2O+ | 2014c | 2.7 × 1014 | 7.0 × 1013 | 3.9 | a few % |
| CH+ | 2015e | 9.7 × 1014 | 1.9 × 1014 | 5.1 | |
| 13CH+ | 2015e | 9.8 × 1012 | 1.3 × 1012 | 7.5 | |
| HF | 2015f | > 3.4 × 1014 | 1.8 × 1013 | > 19 | |
| CH | 2012g | 7.7 × 1014 | 3.5 × 1013 | 22. | ~10–100% |
| HCO+ | 2009h | 1.8 × 1014 | 7.5 × 1012 | 23. | |
| HCN | 2009h | 3.0 × 1014 | 7.3 × 1012 | 42. | |
| C2H | 2009h | 1.2 × 1015 | 2.9 × 1013 | 43. | |
| c-C3H2 | 2009h | 5.3 × 1013 | 1.2 × 1012 | 44. | |
| N2H+ | 2009h | 2.3 × 1013 | < 0.3 × 1012 | >70 | |
o-H O |
2014e | 1.5 × 1013 | < 1.8 × 1011 | > 82 | |
| HNC | 2009h | 1.0 × 1014 | 1.2 × 1012 | 87 | |
| SH+ | 2014e | 3.9 × 1013 | < 3.2 × 1011 | > 120 | |
| p-H2S | 2014e | 6.6 × 1013 | < 4.8 × 1011 | > 140 | |
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| H2 | 2012g,i | ~ 2 × 1022 | ~ 1 × 1021 | ~ 20 | |
Notes. Species are ordered with increasing SW/NE column density ratios, γSW/NE. We note that time variations might affect the comparison of data observed far apart in time.
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