A molecule-rich torus-like structure in the 21 µm source IRAS 23304+6147

Open Access

Table 1

Molecular lines detected in the observations.

Molecule	Transition	E_u (K)	Frequency (MHz)	I_peak (K)	∫I dv (K km s⁻¹)	rms (K)
CO	J=2–1	16.59	230538.00	22.17	216.80	0.16
¹³CO	J=2–1	15.86	220398.67	3.14	30.65	0.14
HC₃N	J=24–23	130.98	218324.71	2.03	18.85	0.14
SiC₂	J_Ka,Kc = 9_4,6−8_4,5	82.28	213208.03	0.32	2.04	0.15
	J_Ka,Kc = 9_4,5−8_4,4	82.28	213292.33	0.32	2.01	0.15
	J_Ka,Kc = 10_2,9−9_2,8	69.62	232534.07	0.28	1.97	0.18
	J_Ka,Kc = 10_6,5−9_6,4	132.37	235713.00	0.25	1.85	0.18
C₄H	N,J=23−22, 47/2−45/2	126.03	218836.98	0.38	3.15	0.14
	N,J=23−22, 45/2−43/2	126.07	218875.35	0.45	3.56	0.14
	N,J=24−23, 47/2−45/2	137.03	228386.92	0.40	3.11	0.16
C¹⁸O	J=2−1	15.81	219560.35	0.32	2.81	0.14
SiS	J=12−11	67.95	217817.66	0.18	0.58	0.14
¹³CN	N,J,F=2−1,3/2−1/2,2−2	15.66	217074.23	0.15	…	0.14
	N,J,F=2−1,5/2−3/2,3−2	15.65	217303.19	0.71	…	0.14
	N,J,F=2−1,3/2−1/2,2−1	15.66	217304.92	0.72	5.12	0.14
	N,J,F=2−1,5/2−3/2,2−2	15.68	217437.70	0.38	2.10	0.14
	N,J,F=2−1,5/2−3/2,4−3	15.68	217467.15	0.52	…	0.14
	N,J,F=2−1,5/2−3/2,2−1	15.69	217469.15	0.52	4.10	0.14
	N,J,F=2−1,5/2−1/2,2−1	15.68	217668.43	0.17	1.13	0.14
	N,J,F=2−1,5/2−1/2,1−1	15.68	217675.39	0.17	1.11	0.14

Notes. The coefficient to convert the intensity unit form Jy beam⁻¹ into K is 105–122 K/(Jy beam⁻¹) at 213−236 GHz for a synthesized beam size of 0.52″ × 0.42″.

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