H2CO in the Horsehead PDR: photo-desorption of dust grain ice mantles

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Table 1

Observation parameters for the maps shown in Fig. 1.

Molecule	Transition	Frequency	Instrument	Beam	PA	Vel. resol.	Int. time	T_sys	Noise	Obs. date
		GHz		arcsec	°	km s^-1	hours	K ()	K (T_mb)

Continuum at 1.2 mm			30m/MAMBO	11.7 × 11.7	0	–	–	–	–	–
DCO⁺	3–2	216.112582	30m/HERA	11.4 × 11.4	0	0.11	1.5/2.0^a	230	0.10	2006 Mar.
p - H₂CO	3₀₃ − 2₀₂	218.222190	30m/HERA	11.9 × 11.9	0	0.05	2.1/3.4^a	280	0.32	2008 Jan.
HCO	1_0,1 3/2,2 − 0_0,0 1/2,1	86.670760	PdBI/C&D	6.69 × 4.39	16	0.20	6.5^b	150	0.09^c	2006–2007

Notes. The projection center of all 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 and the telescope time.

^(b)

On-source time computed as if the source were always observed with six antennae.

^(c)

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

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