Table 4
Observed fractional abundances, relative to H2, in TMC-1 (CP) and corresponding modelled “best fit” values.
| Species | Observed | Calculated | Agree? | Ref. | Species | Observed | Calculated | Agree? | Ref. |
|
|
|||||||||
| C2 | 5.0(–08)1 | 3.0(–10) | C2H | 6.5(-08) | 1.1(-09) | 5 | |||
| C2O | 6.0(–11) | 1.4(–11) | Y | C2S | 3.4(–09) | 9.9(–13) | 3 | ||
| l-C3H | 8.0(–11) | 6.9(–10) | Y | 6 | c-C3H2 | 1.1(–08) | 4.9(–09) | Y | |
| C3N | 6.0(–10) | 1.7(–10) | Y | C3N− | <7.0(–11) | 9.2(–13) | Y | ||
| C3O | 1.0(–10) | 1.4(–10) | Y | C3S | 1.0(–09) | 3.9(–10) | Y | ||
| C4H | 6.1(–08) | 2.1(–09) | C4H− | <2.3(–12) | 1.6(–11) | Y | |||
| C5H | 5.8(–10) | 1.4(–09) | Y | 2 | C5N | 3.0(–11) | 8.1(–11) | Y | 12 |
| C6H | 7.5(–10) | 1.7(–09) | Y | C6H− | 1.2(–11) | 4.2(–11) | Y | ||
| C7H | 1.5(–11) | 4.1(–10) | 2 | C8H | 4.6(–11) | 2.4(–10) | Y | ||
| C8H− | 2.1(–12) | 4.2(–12) | Y | CH | 1.5(–08) | 2.8(–09) | Y | 4 | |
| CH2CHCN | 4.5(–09) | 1.8(–11) | 8 | CH2CN | 5.0(–09) | 1.8(–10) | |||
| CH2CO | 6.0(–10) | 4.4(–08) | CH2NH | <3.6(–09) | 3.5(–10) | Y | 3 | ||
| CH3C3N | 4.5(–11) | 6.5(–10) | 8 | CH3C4H | 1.8(–10) | 7.6(–13) | 9 | ||
| CH3C5N | 7.4(–11) | 2.1(–11) | Y | 11 | CH3C6H | 3.1(–10) | 2.6(–13) | 9 | |
| CH3CCH | 6.0(–09) | 5.6(–10) | CH3CHCH2 | 4.0(–09) | 1.1(–09) | Y | 13 | ||
| CH3CHO | 6.0(–10) | 2.3(–10) | Y | CH3CN | 6.0(–10) | 6.0(–09) | Y | ||
| CH3OH | 3.0(–09) | 9.4(–13) | CN | 5.0(–09) | 1.1(–08) | Y | |||
| CO | 8.0(–05) | 2.5(–04) | Y | CS | 4.0(–09) | 7.6(–09) | Y | ||
| H2CO | 5.0(–08) | 5.7(–08) | Y | H2CS | 7.0(–10) | 2.0(–09) | Y | ||
| H2O | <7.0(–08) | 6.9(–07) | Y | H2S | 5.0(–10) | 4.0(–12) | |||
| H3CO+ | <3.1(–09) | 5.3(–11) | Y | 14 | HC3N | 1.6(–08) | 1.6(–08) | Y | |
| HC3NH+ | 1.0(–10) | 1.6(–11) | Y | HC5N | 5.6(–09) | 3.4(–09) | Y | 3 | |
| HC7N | 1.2(–09) | 1.5(–10) | Y | 3 | HC9N | 8.4(–10) | 2.3(–11) | 3 | |
| HCN | 2.0(–08) | 7.8(–08) | Y | HCNH+ | 2.0(–09) | 5.2(–10) | Y | ||
| HCNO | <1.3(–12) | 2.4(–13) | Y | 10 | HCOOH | 2.0(–10) | 4.2(–10) | Y | |
| HCO+ | 8.0(–09) | 5.0(–09) | Y | HCS+ | 4.0(–10) | 4.3(–12) | |||
| HNC | 2.0(–08) | 6.8(–08) | Y | HNC3 | 6.0(–11) | 1.5(–11) | Y | ||
| HNCO | 5.7(–10) | 2.4(–11) | 10 | N2H+ | 4.0(–10) | 3.8(–11) | |||
| NH3 | 2.0(–08) | 2.9(–08) | Y | NO | 3.0(–08) | 3.9(–09) | Y | ||
| O2 | <7.7(–08) | 3.9(–08) | Y | OCS | 2.0(–09) | 1.4(–11) | |||
| OH | 2.7(–07) | 1.5(–08) | 4 | SO | 1.0(–08) | 1.4(–10) | 7 | ||
| SO2 | 1.0(–09) | 2.1(–12) | |||||||
Notes. The best fit time is 1.7 × 105 years. Of the 63 species below, 41 agree, to within an order of magnitude, with observations. The “Ref.” column gives references for the observed values.
References. (1) See Smith et al. (2004) and Walsh et al. (2009) for source; (2) Bell et al. (1999); (3) Kalenskii et al. (2004); (4) Suutarinen et al. (2011); (5) Sakai et al. (2010a); (6) Fosse et al. (2001); (7) Lique et al. (2006); (8) Lovas et al. (2006); (9) Remijan et al. (2006); (10) Marcelino et al. (2008); (11) Snyder et al. (2006); (12) Guélin et al. (1998); (13) Marcelino et al. (2007); (14) Minh et al. (1993).
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