The HIFI spectral survey of AFGL 2591 (CHESS) - I. Highly excited linear rotor molecules in the high-mass protostellar envelope

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Volume 553 (May 2013)

A&A, 553 (2013) A11

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Table 1

Overview of Herschel/HIFI observations of AFGL2591 used in this work.

Band	Observing date	Herschel obsid	Freq. range^a	t_obs^b	rms noise^c	T_sys^d	HPBW^e	η_mb^f
	(yyyy-mm-dd)		(GHz)	(s)	(mK)	(K)	(′′)	(%)

1a	2010-04-11	1 342 194 483	483–558	4592	30	74	44–38	75.5
1b	2010-04-12	1 342 194 528	555–636	4643	29	87	38–33	75.3
2a	2010-10-28	1 342 207 599	631–722	9833	26	142	34–29	75.1
2b	2010-04-12	1 342 194 573	717–800	6407	67	188	30–27	74.9
3a	2010-10-28	1 342 207 622	800–859	4893	39	200	27–25	74.7
3b	2010-04-13	1 342 194 699	858–960	8578	67	205	25–22	74.4
4a	2010-05-16	1 342 196 594	950–1060	9137	157	356	22–20	74.1
4b	2010-05-11	1 342 196 428	1051–1120	6300	144	339	20–19	73.8
5a	2010-05-12	1 342 196 510	1110–1240	11 931	147	913	19–17	63.7
5b	2011-05-11	1 342 220 520	~1267	1380	149	1246 ^±126	17	63.4
6a	2011-04-21	1 342 219 224	~1497	1440	117	1507 ^±143	14	71.8
6b	2010-12-02	1 342 210 726	~1612	1392	106	1366 ^±104	13	71.1
7a	2010-12-04	1 342 210 803	~1727	1575	92	1300 ^±43	12	70.5
7b	2011-05-11	1 342 220 471	~1841	1711	92	1201 ^±5	12	69.7

Notes.

^(a)

Observations from bands 1a to 5a are spectral scans, those in bands 5b to 7b are single frequency settings spanning ~4 GHz.

^(b)

Observing time, including overheads.

^(c)

Typical rms noise level in 0.5 MHz channels in T_mb units.

^(d)

Double sideband system temperature. For spectral scans (1a–5a): median of the individual datasets, with superscripts and subscripts denoting the deviations to the 90th and 10th percentiles, respectively. For pointed frequency settings (5b−7b): average of the values for the H- and V-datasets, with superscripts denoting the deviation to lowest and highest value.

^(e)

Half-power beam width at the relevant frequency, calculated following Roelfsema et al. (2012). The two values for each spectral scan indicate the HPBW at the lower and upper edge of the band.

^(f)

Typical value of the main beam efficiency in the center of the band.

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