The IRAM-30 m line survey of the Horsehead PDR - IV. Comparative chemistry of H2CO and CH3OH

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Table 2

Observation parameters for the PdBI maps shown in Fig. 4.

Molecule	Transition	Frequency	Instrument	Beam	PA	Vel. resol.	Int. time	T _sys	Noise	Reference
		GHz		arcsec	°	km s^-1	hours	K ()	mK (T_mb)


HCO	1₀₁ 3/2,2−0₀₀ 1/2,1	86.670760	PdBI/C&D	6.7 × 4.4	16	0.20	6.5^a	150	90^b	Gerin et al. (2009)
p − H₂CO	2₀₂−1₀₁	145.602949	PdBI/C&D	6.1 × 5.6	166	0.20	5.3/19^a	145	244	This work
CH₃OH − E	3_-1−2_-1	145.097370	PdBI/C&D	6.1 × 5.6	166	0.20	5.3/19^a	145	116	This work
CH₃OH − A	3₀−2₀	145.103152	PdBI/C&D	6.1 × 5.6	166	0.20	5.3/19^a	145	127	This work

Notes. The projection center of the maps is α₂₀₀₀ = 05^h40^m54.27^s, δ₂₀₀₀ = −02°28′00′′.

^(a)

Two values are given for the integration time: the on-source time (as if the source were always observed with 6 antennae) and the telescope time.

^(b)

The noise values quoted here are the noises at the mosaic phase center (mosaic noise is inhomogeneous due to primary-beam correction; it steeply increases at the mosaic edges).

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