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Table 1

HC3N transitions in the G+0.693 spectral survey (Sect. 2).

Transition (JupJlow) Frequency (GHz) log I (nm2 MHz) Eup (K) Telescope HPBW (″) rms (mK)
Low-J

5–4 45.4903 –3.164 4.4 Yebes 40m 39 0.9
8–7 72.7838 –2.564 12.2 IRAM 30m 34 3.5
9–8 81.8815 –2.416 15.7 IRAM 30m 30 3.5
10–9 90.9790 –2.285 19.6 IRAM 30m 27 1.1
11–10 100.0764 –2.167 24.0 IRAM 30m 24 3.3
12–11 109.1736 –2.061 28.8 IRAM 30m 22 2.0
14–13 127.3677 –1.877 39.7 IRAM 30m 19 9.3
15–14 136.4644 –1.796 45.8 IRAM 30m 18 3.6
16–15 145.5610 –1.722 52.4 IRAM 30m 17 4.8
17–16 154.6573 –1.653 59.4 IRAM 30m 16 2.3
18–17 163.7533 –1.590 66.8 IRAM 30m 15 1.4
19–18 172.8493 –1.531 74.7 IRAM 30m 14 1.6

High-J

22–21 200.1354 –1.379 100.8 IRAM 30m 12 7.3
23–22 209.2302 –1.335 110.5 IRAM 30m 12 7.3
(a) 218.3247 –1.295 120.5 IRAM 30m 11 7.3
24–23 APEX(b) 27 1.0
25–24 227.4189 –1.257 131.0 IRAM 30m 10 7.5
26–25 236.5128 –1.222 141.9 IRAM 30m 10 7.5
APEX 25 2.1

Not used in the analysis

2–1(c) 18.1962 –4.351 0.4 GBT 42 2.3
4–3 (c) 36.3923 –3.452 2.6 Yebes 40m 48 0.9
28–27(d) 254.6995 –1.160 165.0 IRAM 30m 10 10.6
29–28(e) 263.7923 –1.132 177.2 APEX 22 1.3
30–29( f) 272.8847 –1.106 189.8 IRAM 30m 9 10.6

Notes. Columns 1 and 2 list the rotational transitions and the related frequencies, respectively. Log I is the base 10 logarithm of the integrated intensity at 300 K and Eup is the energy of the upper level (Cols. 3 and 4). Columns 5, 6, and 7 indicate the telescope used, the relative halfpower beam width at the frequency of the transition, and the rms achieved, respectively. (a)This transition has also been mapped with SMA+APEX data, as explained in Sect. 2.2. (b)From single-pointing observations described in Sect. 2.1. (c)It includes more extended gas (see Appendix A). (d) Contaminated by CH2NH. (e) Contaminated by HNCO. ( f) Transition intensity within the spectrum noise level.

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