Discovery of two metallic cyanoacetylides in IRC +10216: HMgCCCN and NaCCCN

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Table 1.

Observed line parameters of HMgCCCN and NaCCCN towards IRC +10216.

Transition	ν_obs^(a)	ν_obs − ν_cal^(b)	∫ dv^(c)	(horn) ^(d)	(centre) ^(e)	Notes
J_u − J_l	(MHz)	(MHz)	(mK km s⁻¹)	(mK)	(mK)
HMgCCCN

12-11	31 672.704±0.050	0.0569	39.84	1.48	1.31	^(A)
13-12	34 311.875±0.050	−0.0304	38.53	1.45	1.26
14-13	36 951.092±0.050	−0.0407	42.28	1.59	1.39
15-14	39 590.327±0.020					^(B)
16-15	42 229.489±0.050	0.0040	53.36	2.06	1.72	^(C)
17-16	44 868.617±0.050	0.0118	50.25	2.22	1.48
18-17	47 507.686±0.050	0.0010	72.11	3.06	2.19
19-18	50 146.722±0.040					≤3.5, ^(D)

NaCCCN

12-11	31 705.51±0.20	−0.0447	13.25	0.49	0.44
13-12	34 347.56±0.30	0.0147	11.35	0.43	0.37	^(E)
14-13	36 989.38±0.20	−0.1235	12.17	0.46	0.40
15-14	39 631.36±0.20	−0.0667	11.35	0.44	0.37
16-15	42 273.31±0.20	−0.0024	10.64	0.41	0.34
17-16	44 915.22±0.40	0.0619	17.38	0.77	0.51	^(F)
18-17	47 556.89±0.40	−0.0709	17.67	0.75	0.54

Notes.

^(a)

Observed frequency assuming a V_LSR = −26.5 km s⁻¹.

^(b)

Observed minus calculated frequencies in MHz.

^(c)

Integrated line intensity in mK km s⁻¹. The total uncertainty is assumed to be dominated by the calibration uncertainties of 10%.

^(d)

Antenna temperature at the terminal velocity (horn) in mK.

^(e)

Antenna temperature at line centre in mK.

^(A)

Line partially blended with a weak hyperfine component of CC¹³CH. Frequency and line parameters can be correctly estimated adopting the observed intensities of the other hyperfine components of CC¹³CH (see top panel of Fig. 1).

^(B)

Line fully blended with C₃N. Frequency and line parameters cannot be estimated. The quoted frequency corresponds to the predicted one.

^(C)

Line partially blended with c − C₃H₂. Frequency and line parameters can still be estimated.

^(D)

Line not detected. The upper limit in antenna temperature corresponds to 3σ. The quoted frequency corresponds to the predicted one.

^(E)

Line partially blended with an unknown feature. Frequency and line parameters can still be estimated.

^(F)

Line blended with an unknown feature and with a line from HC₉N in the 3ν₁₉ state. Frequency and line parameters are very uncertain.

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