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

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Table 1

Observation parameters for the 30 m maps shown in Fig. 3.

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


Continuum at 1.2 mm			30 m/MAMBO	–	11.7 × 11.7	–	–	–	–	Hily-Blant et al. (2005)
DCO⁺	3–2	216.112582	30 m/HERA	FSW	11.4 × 11.4	0.11	1.5/2.0^a	230	0.10	Pety et al. (2007)
p − H₂CO	3₀₃−2₀₂	218.222190	30 m/HERA	PSW	11.9 × 11.9	0.05	2.1/3.4^a	280	0.32	Guzmán et al. (2011)
p − H₂CO	2₀₂−1₀₁	145.602949	30 m/EMIR	PSW	17.8 × 17.8	0.20	7.4/12.9^a	208	0.17	This work
CH₃OH − E	3_-1−2_-1	145.097370	30 m/EMIR	PSW	17.9 × 17.9	0.20	7.4/12.9^a	208	0.108^b	This work
			30 m/C150	FSW	17.9 × 17.9	0.20	2.6/3.2^a	163	0.108^b	This work
CH₃OH − A	3₀−2₀	145.103152	30 m/EMIR	PSW	17.9 × 17.9	0.20	7.4/12.9^a	208	0.095^b	This work
			30 m/C150	FSW	17.9 × 17.9	0.20	2.6/3.2^a	263	0.095^b	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 and the telescope time.

^(b)

The noise value is computed on the final maps that combine the data from both observing runs (2007 and 2012).

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