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Table 1

Observation parameters for the maps.

Line Frequency Instrument Feff Beff Beam PA Int. timea Tsys Noise Obs. date
GHz arcsec ° h K () K (Tmb)

HCO 10,1   3/2,2−00,0   1/2,1 86.670760 PdBI/C&D 0.95 0.78 6.7 × 4.4 16 6.5 150 0.09 2006–2007
CF+ 1−0 102.587533 30 m/EMIR 0.94 0.79 25.4 0 2.5 88 0.03b Jan. 2012
CF+ 2−1 205.170520 30 m/EMIR 0.94 0.64 11.4 0 3.4 220 0.18c Jan. 2012
DCO+ 3−2 216.112582 30 m/HERA 0.90 0.52 11.4 0 1.5 230 0.10 Mar. 2006

Notes. Their projection center is α2000 = 05h40m54.27s, δ2000 =  −02°28′00″.

(a)

On-source integration time. The noise values are for a spectral resolution of

(b)

0.114   km   s-1 and

(c)

0.057   km   s-1.

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