Table 6.
Observed and simulated fractional abundances of L483.
| Species | L483 | RE | Two-phase | Basic multi-phase | New 0 | New 1 | New 2 | New 3 |
|---|---|---|---|---|---|---|---|---|
| C4H | 7.0(–10)a,b | 1.5(–09) | 6.9(–10) | 6.5(–10) | 3.5(–10) | 3.9(–10) | 4.5(–10) | 6.5(–10) |
| C3H2j | 1.8(–10)c | 7.7(–10) | 4.8(–10) | 8.7(–10) | 5.5(–10) | 5.7(–10) | 6.6(–10) | 8.8(–10) |
| HC3N | 5.2(–10)d | 1.5(–09) | 1.4(–09) | 5.3(–10) | 3.4(–10) | 3.3(–10) | 3.8(–10) | 5.6(–10) |
| HC5N | 2.9(–10)d | 2.5(–10) | 1.5(–10) | 3.9(–11) | 2.3(−11)i | 1.8(−11) | 2.5(−11) | 4.4(–11) |
| CCS | 2.1(–10)d | 2.9(–11) | 2.1(–11) | 3.0(–11) | 1.4(−11) | 1.3(−11) | 1.2(−11) | 1.9(−11) |
| CO | 1.4(–05)e | 2.9(–05) | 2.8(–05) | 4.7(−09) | 4.5(−07) | 4.3(−07) | 4.9(−07) | 2.3(−07) |
| HCN | 2.0(–09)e | 2.3(–09) | 2.9(–09) | 5.5(–09) | 3.3(–09) | 3.0(–09) | 3.2(–09) | 4.1(–09) |
| HNC | 3.9(–10)e | 1.6(–09) | 2.0(–09) | 5.0(−09) | 2.6(–09) | 2.5(–09) | 2.6(–09) | 3.6(–09) |
| CS | 6.8(–10)e | 1.3(–10) | 9.1(–11) | 1.9(–10) | 2.6(–10) | 2.4(–10) | 2.2(–10) | 1.9(–10) |
| SO | 2.9(–10)e | 7.6(–11) | 1.7(–10) | 1.0(−12) | 1.0(–10) | 8.5(–11) | 7.1(–11) | 2.5(−11) |
| HCO+ | 2.0(–09)e | 1.6(–09) | 1.5(–09) | 5.0(−12) | 3.0(–10) | 3.0(–10) | 3.2(–10) | 1.7(−10) |
| N2H+ | 7.5(–10)e | 1.0(−11) | 3.0(−11) | 3.1(–10) | 3.7(–10) | 3.6(–10) | 3.2(–10) | 2.4(–10) |
| CN | 8.3(–10)e | 1.0(–09) | 2.4(–09) | 9.2(−09) | 4.4(–09) | 4.4(–09) | 4.4(–09) | 6.8(–09) |
| CH3OH | 4.3(–10)f | 2.1(–10) | 3.0(–09) | 1.8(−11) | 2.2(–10) | 2.0(–10) | 2.2(–10) | 2.1(–10) |
| NH3 | 2.5(–08)d | 4.9(–09) | 1.4(–08) | 1.1(–08) | 1.1(–08) | 1.0(–08) | 9.5(–09) | 9.0(–09) |
| H2CO | 8.3(–10)g | 6.8(–09) | 5.1(–09) | 3.6(−11) | 7.0(–09) | 6.0(–09) | 6.6(–09) | 2.5(–09) |
| HCCO | 7.2(–12)h | 1.1(−13) | 0k | 0k | 3.8(–11) | 2.4(–11) | 1.5(–11) | 1.0(–12) |
| CH3CHO | 5.3(–11)h | 1.5(–10) | 3.8(−12) | 8.3(–12) | 1.3(−12) | 7.5(−13) | 5.0(−13) | 0k |
| HCO | 4.5(–11)h | 1.0(–10) | 3.6(–10) | 5.0(−13) | 3.5(–11) | 3.0(–11) | 2.7(–11) | 1.3(–11) |
| κmax | – | 0.605 | 0.563 | 0.383 | 0.549 | 0.544 | 0.551 | 0.488 |
| tcold + Δt (105 yr) | – | 3.652 | 3.617 | 3.700 | 3.676 | 3.695 | 3.672 | 3.684 |
| T (K) | – | 30.19 | 28.08 | 33.28 | 31.71 | 32.94 | 31.45 | 32.22 |
| Number of fits | 19 | 17 | 16 | 10 | 15 | 15 | 15 | 14 |
Notes. (a) a(b) = a × 10b. (b) Sakai et al. (2009b). (c) Benson et al. (1998). (d) Hirota et al. (2009). (e) Jørgensen et al. (2004). (f) Jørgensen et al. (2002). (g) Tafalla et al. (2000). (h) Agúndez et al. (2015). (i)Bold type indicates overproduction or underproduction by one order of magnitude or more. (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. So far only l-C3 H2 is observed towards L483. (k)These numbers are below 10−13 and for convenience we designate them as 0.
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