The HIFI spectral survey of AFGL 2591 (CHESS) - II. Summary of the survey

M. Kaźmierczak-Barthel; F. F. S.  van der Tak; F. P. Helmich; L. Chavarría; K.-S. Wang; C. Ceccarelli

doi:10.1051/0004-6361/201322819

Free Access

Table 3

Parameters estimated from rotational and population diagrams methods (column densities, excitation temperatures, and emission extents) based on HIFI and JCMT data.


Molecule	V	FWHM	Rotational		Population			τ	E_up range	No of trans.


	[km s^-1]	[km s^-1]	N_col[cm^-2]	T_ex[K]	N_col[cm^-2]	T_ex[K]	size[′′]		[K]


CO	−4.8^{± 0.3}	5.1^±0.9	6.0 × 10¹⁶	162	1.2 × 10¹⁹	62	17	0.1–144	33–752	12
	−7.2^{± 2.3}	15.4^±1.8	6.0 × 10¹⁶	89	8.0 × 10¹⁸	42	17	0.01–34	33–752	12
HCO⁺	−5.6^{± 0.2}	3.4^±0.4	2.3 × 10¹³	35	1.0 × 10¹⁴	43	11	0.08–2.02	43–283	7
	−6.8^{± 0.6}	7.3^±2.0	2.2 × 10¹³	23	2.0 × 10¹⁵	19	9.7	0.7–35	43–154	4
HCN	−5.3^{± 0.2}	4.2^±0.7	4.5 × 10¹³	31	1.1 × 10¹⁵	35	7.7	0.2–4.4	43–234	6
HNC^a	−5.4^±0.1	3.8^±0.5	4.8 × 10¹²	43					44–122	3
CCH	−6.3^{± 0.5}	3.7^±0.5	2.2 × 10¹⁴	22	1.1 × 10¹⁶	25	5.3	0.3–7.1	42–151	4
CN^a	−5.6^{± 0.2}	3.2^±0.5	9.7 × 10¹³	22	1.3 × 10¹⁴	26	23	0.01–0.18	33–114	3
CS	−5.5^{± 0.4}	3.9^±0.5	7.4 × 10¹³	26	4.9 × 10¹³	61	14	0.01–0.09	66–282	7
H₂S	−5.7^{± 0.7}	3.4^±0.8	1.1 × 10¹³	56	4.9 × 10¹⁴	26	8.9	0.01–5.6	55–350	5
NH₃	−5.1^{± 0.6}	4.1^±1.0	2.8 × 10¹³	67	4.8 × 10¹³	28	9.6	0.1–1.6	28–170	5
N₂H⁺^a	−5.9^{± 0.2}	2.8^±0.3	5.6 × 10¹¹	19					45–125	3
NO^a	−4.8^{± 0.5}	5.8^±2.8	7.2 × 10¹⁵	25	1.7× 10¹⁶	54	12	0.015–0.021	36–115	2
CH₃OH	−5.7^{± 0.5}	3.3^±0.6	1.8 × 10¹⁴	209	1.5 × 10¹⁷	108	1.5	0.6–10.4	25–352	49
H₂CO	−5.4^{± 0.3}	3.6^±0.7	2.0 × 10¹³	34	9.9 × 10¹³	41	7.3	0.02–0.61	32–263	14
SO	−5.5^{± 0.4}	4.9^±0.7	1.5 × 10¹⁴	53	1.9 × 10¹⁶	64	2.7	0.1–6.1	26–405	22
SO₂	−5.1^{± 0.4}	4.6^±0.9	3.0 × 10¹⁴	92	5.4 × 10¹⁷	175	0.9	0.5–8.9	31-354	47
H₂O	−4.8^{± 0.9}	3.1^±0.6	3.5 × 10¹³	63	2.4 × 10¹⁵	38	9.1	0.4–104	53–305	8
	−6.0^{± 0.2}	12.1^±2.3	5.5 × 10¹³	43	1.0 × 10¹⁶	31	4.9	0.2–5.7	101–305	6

Notes. The second column shows the values of the central velocity of the observed lines. When there are two values, the first corresponds to the envelope component, the second to the outflow. The last 3 columns show first the range of optical depth τ for observed lines, then the E_up range, which is covered by observed features, and finally the number of lines from different energy levels used for the analysis; i.e., we observed 4 lines of NO, but they originate only from 2 different energy levels. Population diagram method was used when at least 4 lines of a given molecule were observed, which is why there are no values for HNC and N₂H⁺.

^(a)

Indicates higher uncertainty of measurements because e.g. only 3 different levels were observed.

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