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Table 2

Observed spectral-line transitions and observational parameters.

Transition νa HPBW ηMB Tsys PWV Channel spacingb tint rms
[MHz] [′′] [K] [mm] [kHz] [km s-1] [min] [mK]
SiO(5−4) 217 104.980 28.7 0.75 324–360 0.7–1.2 122.07 0.17 9.5 38–43
DCN(3−2)c 217 238.61c 28.7 0.75 337 0.8–0.9 122.07 0.17 9.5 39
13CO(2−1) 220 398.70056d 28.3 0.75 282–371 0.8–1.0 122.07 0.17 9.5 43–46
C17O(2−1) 224 714.199e 27.8 0.75 392–418 0.7–1.7 122.07 0.16 2.6 81–102
CH3OH(5 − 1,5 − 4 − 1,4)-E 241 767.224 25.8 0.75 430–445 0.4–0.8 122.07 0.15 10.5–15.5 39–49
CH3OH(50,5 − 40,4)-A+ 241 791.431 ... ... ... ... ... ... ... ...
CH3OH(54,∗ − 44,∗)-A+/−f 241 806.508 ... ... ... ... ... ... ... ...

Notes. Columns (2)–(10) give the rest frequencies of the observed transitions (ν), the APEX beamsize (HPBW) and the main beam efficiency (ηMB) at the observed frequencies, the single-sideband system temperatures during the observations (Tsys in TMB scale, see text), the amount of precipitable water vapour (PWV), channel widths (both in kHz and km s-1) of the original data, the on-source integration times per position (tint), and the 1σ rms noise at the smoothed resolution.

(a)

The rest frequencies were taken from the Cologne Database for Molecular Spectroscopy (CDMS; http://www.astro.uni-koeln.de/cdms/catalog) (Müller et al. 2005) unless otherwise stated.

(b)

The original channel spacings. The final spectra were Hanning-smoothed by dividing the number of channels by two.

(c)

The DCN(3 − 2) transition was additionally detected in the band covering the SiO(5−4) line. The quoted frequency refers to the strongest hyperfine component F = 4−3.

(d)

The frequency was taken from Cazzoli et al. (2004) and refers to the strongest hyperfine component F = 5/2−3/2.

(e)

The frequency was taken from Ladd et al. (1998) and refers to the strongest hyperfine component F = 9/2−7/2.

(f)

A blend of CH3OH(54,1 − 44,0)-A+ and CH3OH(54,2 − 44,1)-A−, which have the same frequency.

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