Table 11
H2 column densities and visual extinctions derived from the HCO+ column densities determined in the ALMA spectrum in the direction of K4.
| vLSRa | N(H13CO+)b | N(HCO+)c | N(H2)d | Ave | N(H2)f | Ave |
|---|---|---|---|---|---|---|
| (km s−1) | (cm−2) | (cm−2) | (cm−2) | (mag) | (cm−2) | (mag) |
| 40.8 | 1.3(12) | 5.2(13)* | 1.7(22) | 18.4 | 3.6(21) | 3.8 |
| 27.0 | 6.2(11) | 2.4(13)* | 8.0(21) | 8.5 | 2.5(21) | 2.7 |
| 18.6 | 4.5(12) | 2.7(14)* | 9.0(22) | 95.7 | 1.4(22) | 14.4 |
| 9.8 | 1.5(12) | 3.0(13)* | 1.0(22) | 10.6 | 2.8(21) | 3.0 |
| 3.8 | 8.0(12) | 1.6(14)* | 5.3(22) | 56.7 | 8.0(21) | 8.5 |
| −1.7 | 3.8(12) | 7.6(13)* | 2.5(22) | 27.0 | 4.3(21) | 4.5 |
| −6.9 | 2.0(12) | 8.0(13)* | 2.7(22) | 28.4 | 4.4(21) | 4.6 |
| −17.2 | 2.1(12) | 8.4(13)* | 2.8(22) | 29.8 | 4.5(21) | 4.7 |
| −28.1 | 1.8(12) | 3.2(13)* | 1.1(22) | 11.3 | 2.9(21) | 3.0 |
| −35.2 | – | 2.4(13) | 8.0(21) | 8.5 | 2.5(21) | 2.7 |
| −41.2 | 5.1(12) | 2.1(14)* | 7.0(22) | 74.5 | 1.1(22) | 11.1 |
| −48.8 | 5.7(11) | 2.3(13)* | 7.7(21) | 8.2 | 2.5(21) | 2.6 |
| −56.3 | – | 2.1(13) | 7.0(21) | 7.4 | 2.4(21) | 2.5 |
| −66.3 | – | 2.3(13) | 7.7(21) | 8.2 | 2.5(21) | 2.6 |
| −76.4 | 2.7(12) | 5.6(13)* | 1.9(22) | 19.9 | 3.7(21) | 3.9 |
| −83.9 | – | 8.6(12) | 2.9(21) | 3.0 | 1.6(21) | 1.7 |
| −91.9 | – | 2.6(13) | 8.7(21) | 9.2 | 2.8(21) | 2.8 |
| −104.3 | 1.7(12) | 9.2(13) | 3.1(22) | 32.6 | 4.7(21) | 5.0 |
| −114.1 | – | 5.0(12) | 1.7(21) | 1.8 | 1.2(21) | 1.3 |
| −122.8 | 4.8(11) | 1.5(13) | 5.0(21) | 5.3 | 2.0(21) | 2.1 |
| −134.6 | – | 1.0(12) | 3.3(20) | 0.4 | 3.3(20) | 0.4 |
Notes. X(Y) corresponds to X × 10Y. The excitation temperature is assumed to be 2.73 K. (a) Centroid velocity of the Gaussian component. (b) H13CO+ column density. A dash indicates the cases where H13CO+ is too weak. (c) HCO+ column density. A star indicates the cases when it is derived from H13CO+. (d) H2 column density derived from HCO+ assuming an HCO+ abundance of 3 × 10−9 relative to H2 typical for diffuse clouds (Liszt et al. 2010). (e)Visual extinction computed from the previous column with the formula Av (mag) = N(H2)/(9.4 × 1020 cm−2). (f) H2 column density derived from HCO+ assuming a HCO+ abundance of 3 × 10−9 for N(HCO+) < 2.8 × 1012 cm−2, 2 × 10−8 for N(HCO+) > 9.4 × 1013 cm−2, and an interpolated value (in log–log space) in between.
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