Free Access
Table 2
Observed molecular species.
| Molecule | Transition | Rest frequency | A | gu | Eu | Comments |
| (GHz) | (× 10-5 s-1) | (K) | ||||
|
|
||||||
| CH3C2H | 53−43 | 85.442 600 | 0.129778 | 44 | 77.37 | Tracer of dense gas, |
| 52−42 | 85.450 765 | 0.170373 | 22 | 41.22 | good thermometer | |
| 51−41 | 85.455 665 | 0.194760 | 22 | 19.53 | ||
| 50−40 | 85.457 299 | 0.202908 | 22 | 12.30 | ||
| H13CN | 11−01 | 86.338 735 | Tracer of dense gas, | |||
| 12−01 | 86.340 167 | 2.8 | 9 | 4.14 | infall motions | |
| 10−01 | 86.342 256 | |||||
| H13CO+ | 1−0 | 86.754 330 | 2.8 | 3 | 4.16 | Tracer of dense gas |
| SiO | 2−1 | 86.847 010 | 2.0 | 5 | 6.25 | Tracer of shocked gas |
| C2H | 1−0 3/2−1/2 F = 2−1 | 87.316 925 | 0.152757 | 5 | 4.19 | Tracer of early |
| stages of | ||||||
| star formation | ||||||
| HNCO | 40,4−30,3 | 87.925 238 | 0.878011 | 9 | 10.55 | Indicates denser gas than |
| other high-density tracers | ||||||
| HCN | 11−01 | 88.630 4157 | Tracer of dense gas, | |||
| 12−01 | 88.631 8473 | 2.4 | 9 | 4.25 | infall motions | |
| 10−01 | 88.633 9360 | |||||
| HCO+ | 1−0 | 89.188 526 | 3.0 | 3 | 4.28 | Tracer of dense gas, |
| outflows | ||||||
| HNC | 10−01 | 90.663 450 | Tracer of dense gas | |||
| 12−01 | 90.663 574 | 2.7 | 3 | 4.35 | ||
| 11−01 | 90.663 656 | |||||
| HC3N | 10−9 | 90.978 989 | 5.81300 | 21 | 24.02 | Indicates denser gas than |
| other high-density tracers | ||||||
| CH3CN | 54−44 | 91.959 206 | 2.27824 | 22 | 127.60 | Tracer of warm and |
| 53−43 | 91.971 465 | 4.05228 | 44 | 77.58 | dense regions | |
| 52−42 | 91.980 089 | 5.31863 | 22 | 41.84 | ||
| 51−41 | 91.985 316 | 6.07995 | 22 | 20.39 | ||
| 50−40 | 91.987 089 | 6.33432 | 22 | 13.25 | ||
| 13CS | 2−1 | 92.494 303 | 1.41254 | 10 | 6.66 | Tracer of dense gas |
| N2H+ | 111−001 | 93.171 621 | Tracer of quiescent gas, | |||
| 111−022 | 93.171 917 | “late depleter” | ||||
| 111−010 | 93.172 053 | |||||
| 121−021 | 93.173 480 | |||||
| 121−032 | 93.173 777 | 3.8534 | 27 | 4.47 | ||
| 121−011 | 93.173 967 | |||||
| 101−012 | 93.176 265 | |||||
Notes. Columns are species, transition, rest frequency, Einstein A coefficients, degeneracy, energy of the upper level, comments.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.