Table 3
Properties of spectral lines detected in NGC 4418.
| Line | Rest frequency | E u | Peak flux | T b | v c | Δv | Source size | |
| [GHz] | [K] | [mJy] | [K] | [km s-1] | [km s-1] | circ . aver . | ||
|
|
||||||||
| HI | 1.420 | 0.07 | –6 ± 0.5 | – | 2153 ± 11 | 131 ± 12 | >0.5′′, 80 pc | |
| ′′ | ′′ | –2 ± 0.5 | – | 2094 ± 22 | 160 ± 18 | >0.5′′, 80 pc | ||
| CO 2–1 | 230.538 | 17 | 439 ± 6 | 80 ± 0.6 | 2091 ± 3 | 163 ± 6 | 0.7′′, 120 pc | |
| ′′ | ′′ | 140 ± 6 | 26 ± 0.6 | 2182 ± 13 | 165 ± 11 | 0.7′′, 120 pc | ||
| HC3N 25–24, v6 = 1e | 227.793 | 860 | 9 ± 6 | >2.2 ± 1.4 | 2120* | 100* | <0.4′′, 65 pc | |
| HC3N 25–24, v6 = 1f | 227.970 | 860 | 9 ± 6 | >2.2 ± 1.4 | 2122 ± 9 | 93.8 ± 19 | <0.4′′, 65 pc | |
| HC3N 25–24, v7 = 1e | 227.977 | 463 | 36 ± 6 | >8.8 ± 1.4 | 2120* | 100* | <0.4′′, 65 pc | |
| HC3N 25–24, v7 = 1f | 228.303 | 463 | 36 ± 6 | >8.8 ± 1.4 | 2120* | 100* | <0.4′′, 65 pc | |
| HC3N 25–24, v7 = 2 | 228.858 | 787 | 12 ± 6 | >3.0 ± 1.4 | 2120* | 100* | <0.4′′, 65 pc | |
| C34S 5–4 | 241.016 | 28 | 43 ± 3 | 13 ± 1 | 2143 ± 4 | 77 ± 11 | 0.35′′, 57 pc | |
HNC(a)
|
HNC 3–2 | 271.981 | 26 | 167 ± 7 | >40.6 ± 1.6 | 2090* | 130 ± 17 | <0.3′′, 50 pc |
| ′′ | ′′ | 54 ± 7 | >13.2 ± 1.6 | 2180* | 141 ± 21 | <0.3′′, 50 pc | ||
|
HNC(b)
|
HNC 3–2 | 271.981 | 26 | 167 ± 7 | >40.6 ± 1.6 | 2100* | 130 ± 17 | <0.3′′, 50 pc |
| HNC, v2 = 1e | 271.924 | 692 | 43 ± 7 | >10.4 ± 1.6 | 2100* | 85 ± 21 | <0.3′′, 50 pc | |
| HC3N 30–29 | 272.884 | 203 | 79 ± 7 | >19.2 ± 1.6 | 2140 ± 11 | 115 ± 6 | <0.3′′, 50 pc | |
| HC3N 30–29, v6 = 1e | 273.331 | 921 | 13 ± 7 | >3.2 ± 1.6 | 2120* | 80* | <0.3′′, 50 pc | |
| HC3N 30–29, v6 = 1f | 273.546 | 921 | 13 ± 7 | >3.2 ± 1.6 | 2120* | 80* | <0.3′′, 50 pc | |
| HC3N 30–29, v7 = 1e | 273.553 | 524 | 40 ± 7 | >9.8 ± 1.6 | 2120* | 80* | <0.3′′, 50 pc | |
| HC3N 30–29, v7 = 1f | 273.944 | 524 | 40 ± 7 | >9.8 ± 1.6 | 2120* | 78 ± 12 | <0.3′′, 50 pc | |
| HNC 3–2, v2 = 1f | 273.869 | 692 | 55 ± 7 | >13.4 ± 1.6 | 2100* | 78 ± 11 | <0.3′′, 50 pc | |
| HC3N 31–30, v6 = 1f | 282.660 | 934 | 13 ± 10 | >3.2 ± 2.4 | 2100* | 80* | <0.3′′, 50 pc | |
| HC3N 31–30, v7 = 1e | 282.668 | 538 | 39 ± 10 | >9.4 ± 2.4 | 2100* | 80* | <0.3′′, 50 pc | |
| HC3N 31–30, v7 = 1f | 283.072 | 538 | 39 ± 10 | >9.4 ± 2.4 | 2112 ± 11 | 82 ± 25 | <0.3′′, 50 pc | |
Notes. Results of Gaussian fitting are shown together with circle-averaged source sizes. Line-peak flux densities refer to the flux density integrated on the central clean beam. We converted the flux density to main-beam brightness Tmb by applying the K/Jy conversion factor of Table 2. For the resolved emission, we report the deconvolved brightness temperature Tb, or its lower limit in the case of unresolved emission. Errors on the measured flux densities and brightness temperatures are reported in parentheses. Line-center velocities Vc are LSR optical velocities. For HNC 3–2, for which two alternative fits are possible, these are labeled with (a) and (b), see Sect. 3.4.2. Source sizes are FWHM sizes derived from fitting circle-averaged visibilities with circular Gaussian profiles (see Fig. A.1). For strong line blending, the velocity and line width of the emission were fixed to the values derived for blend-free transitions. Fixed values are marked with an asterisk in the table.
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