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Table 1

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

Band Observing date Herschel obsid Freq. rangea tobsb rms noisec Tsysd HPBWe ηmbf
(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 Tmb 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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