Table 4.
Observed and simulated fractional abundances of L1527.
| Species | L1527 | RE | Two-phase | Basic multi-phase | New 0 | New 1 | New 2 | New 3 |
|---|---|---|---|---|---|---|---|---|
| C2H | 1.2(–08)a,b | 8.0(–09) | 6.0(–09) | 2.9(–09) | 1.6(–09) | 1.7(–09) | 1.8(–09) | 3.0(–09) |
| C3Hi | 5.5(–11)c | 2.8(–10) | 3.0(–10) | 8.2(−10)h | 5.3(–10) | 5.7(−10) | 6.2(−10) | 1.0(−09) |
| C4H | 3.2(–09)d | 6.6(–10) | 5.0(–10) | 5.0(–10) | 3.6(–10) | 3.4(–10) | 4.0(–10) | 7.6(–10) |
| C5H | 1.5(–11)d | 1.6(−10) | 1.2(–10) | 6.6(–11) | 4.8(–11) | 4.8(–11) | 6.5(–11) | 1.2(–10) |
| C6H | 1.0(–11)d | 3.8(–11) | 2.5(–11) | 1.1(–11) | 8.8(–12) | 1.1(–11) | 1.2(–11) | 2.9(–11) |
| C3H2j | 2.4(–10)b,c | 4.1(–10) | 4.1(–10) | 7.9(–10) | 5.8(–10) | 5.8(–10) | 6.3(–10) | 9.7(–10) |
| C4H2 | 2.7(–11)b | 3.0(−09) | 2.1(−09) | 6.9(−10) | 6.1(−10) | 6.2(−10) | 6.8(−10) | 1.1(−09) |
| C6H2 | 2.5(–12)d | 3.6(−10) | 1.9(−10) | 3.3(−11) | 3.9(−11) | 3.6(−11) | 3.8(−11) | 7.2(−11) |
| CH3CCH | 1.0(–09)d | 3.2(–09) | 1.9(–09) | 1.3(−11) | 5.8(−11) | 5.5(−11) | 6.5(−11) | 5.3(−11) |
| HC3N | 4.5(–10)c | 1.5(–09) | 1.2(–09) | 6.0(–10) | 3.4(–10) | 3.3(–10) | 4.0(–10) | 6.4(–10) |
| HC5N | 1.1(–10)c | 1.7(–10) | 1.1(–10) | 3.1(–11) | 1.9(–11) | 2.6(–11) | 2.8(–11) | 5.1(–11) |
| HC7N | 2.5(–11)d | 2.1(–11) | 1.1(–11) | 4.3(–12) | 3.0(–12) | 3.0(–12) | 5.0(–12) | 9.0(–12) |
| HC9N | 2.3(–12)d | 2.2(–12) | 1.5(–12) | 2.5(–13) | 2.5(–13) | 5.0(–13) | 5.0(–13) | 1.0(–12) |
| CCS | 8.5(–11)d | 3.5(–11) | 2.0(–11) | 2.6(–11) | 1.4(–11) | 9.8(–12) | 1.2(–11) | 2.0(–11) |
HCO |
1.0(–12)b | 6.4(–13) | 1.3(–12) | 0k | 1.0(–12) | 1.0(–12) | 1.0(–12) | 5.0(–13) |
| NH3 | 8.3(–09)e | 8.3(–09) | 1.5(–08) | 1.1(–08) | 1.1(–08) | 1.0(–08) | 9.5(–09) | 8.8(–09) |
| CO | 3.9(–05)f | 2.9(–05) | 2.8(–05) | 4.4(−09) | 4.5(−07) | 4.0(−07) | 4.7(−07) | 2.3(−07) |
| CN | 8.0(–11)f | 2.6(−09) | 2.7(−09) | 9.8(−09) | 4.3(−09) | 4.4(−09) | 4.5(−09) | 7.0(−09) |
| CS | 3.3(–10)f | 1.5(–10) | 9.0(–11) | 1.9(–10) | 2.5(–10) | 2.2(–10) | 2.3(–10) | 2.0(–10) |
| HCN | 1.2(–09)f | 2.7(–09) | 2.9(–09) | 5.9(–09) | 3.2(–09) | 3.2(–09) | 3.3(–09) | 4.2(–09) |
| HNC | 3.2(–10)f | 1.9(–09) | 2.1(–09) | 5.4(−09) | 2.5(–09) | 2.6(–09) | 2.6(–09) | 3.7(−09) |
| HCO+ | 6.0(–10)f | 1.6(–09) | 1.5(–09) | 6.5(−12) | 3.0(–10) | 2.7(–10) | 3.0(–10) | 1.8(–10) |
| N2H+ | 2.5(–10)f | 9.8(−12) | 3.6(–11) | 3.0(–10) | 3.7(–10) | 3.3(–10) | 3.0(–10) | 2.4(–10) |
| SO | 1.4(–10)f | 6.6(–11) | 1.7(–10) | 1.5(−12) | 1.1(–10) | 8.3(–11) | 7.2(–11) | 2.2(–11) |
| CH4 | 2.2-7.6(–06)g | 1.2(–05) | 5.2(–06) | 8.0(−08) | 2.9(–07) | 2.8(–07) | 3.2(–07) | 2.5(–07) |
| CH3OH | 1.1(–09)c | 3.5(–10) | 2.7(–09) | 2.0(−11) | 2.2(–10) | 2.1(–10) | 2.3(–10) | 2.1(–10) |
| κmax | – | 0.604 | 0.616 | 0.398 | 0.531 | 0.532 | 0.542 | 0.506 |
| tcold + Δt (105 yr) | – | 3.587 | 3.604 | 3.674 | 3.681 | 3.671 | 3.671 | 3.681 |
| T (K) | – | 26.37 | 27.33 | 31.58 | 32.03 | 31.39 | 31.39 | 32.03 |
| Number of fits | 26 | 21 | 23 | 14 | 21 | 20 | 20 | 19 |
Notes. (a) a(b) = a × 10b. (b) Sakai et al. (2009b). (c) Sakai et al. (2009a). (d) Sakai et al. (2008). (e) Hirota et al. (2009). (f) Jørgensen et al. (2004). (g)Sakai et al. (2012). (h)Bold type indicates overproduction or underproduction by one order of magnitude or more. (i) l-C3H and c-C3H are isomers but they are not distinguished in the reaction network. The results represent the sum of the abundances of l-C3 H and c-C3 H. So far only l-C3 H is observed towards L1527. (j) l-C3H2 and c-C3 H2 are isomers but they are not distinguished in the reaction network. The results represent the sum of the abundances of l-C3 H2 and c-C3 H2. The observation towards L1527 is the total abundance of l-C3 H2 and c-C3 H2. (k) This number is below 10−13 and for convenience we designate it as 0.
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