Astronomy & Astrophysics

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$\begin{figure} {\includegraphics[angle=-90,width=14cm]{8973fig1.eps} }\end{figure}$ Figure 1: Left panel: map of the emission of the N₂D⁺ (3-2) line integrated between -18.37 and -16.7 km s^-1, obtained with the SMA towards I05345 (red contours). The two main condensations are indicated as N and S. Contour levels start from the 3 $\sigma$ rms ( $\sim$ 0.09 Jy beam^-1), and are in steps of 2 $\sigma$ . The grey scale represents the 225 GHz continuum (first level is the 3 $\sigma$ rms = 0.006 Jy beam^-1; step = 3 $\sigma$ rms). The three compact continuum cores are indicated as C1, C2 and C3. The cross corresponds to the map centre (I05345 nominal position) and the dashed circle represents the SMA primary beam at 225 GHz ( $\sim$ 56 $^{\prime \prime }$ ). The ellipse in the bottom left corner shows the synthesised beam of the N₂D⁺ image.
Right panel: map of the N₂H⁺ (3-2) line emission integrated between -19.6 and -16.1 km s^-1 towards I05345 (green contours), observed with the SMA (first contour = 3 $\sigma$ rms [ $\sim$ 0.45 Jy beam^-1]; step = 2 $\sigma$ rms). The grey scale represents the 284 GHz continuum (first level is the 3 $\sigma$ rms = 0.018 Jy beam^-1; step = 3 $\sigma$ rms). The dashed circle represents the primary beam at 284 GHz ( $\sim$ 44 $^{\prime \prime }$ ). The cross indicates the map centre and the ellipse in the bottom left corner is the SMA synthesised beam of the N₂H⁺ image.
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In the text

$\begin{figure} {\includegraphics[angle=-90,width=11.5cm]{8973fig2.eps} } \end{figure}$ Figure 2: Map of the intensity of the N₂H⁺ (1-0) line (green contours) integrated between -21.2 and -14.5 km s^-1, corresponding to the main group of the hyperfine components, observed with the PdBI. Levels range from the 3 $\sigma$ rms, which is $\sim 0.02$ Jy beam^-1, to 0.26 Jy beam^-1, in steps of 3 $\sigma$ . The grey scale represents the 97 GHz continuum: the levels range from the 3 $\sigma$ rms ( $4.2\times 10^{-4}$ Jy beam^-1) to $4\times 10^{-3}$ Jy beam^-1, in steps of 3 $\sigma$ . Below the map, the spectra of N₂D⁺ (3-2) and N₂H⁺ (1-0) integrated over the red contours, which correspond to the 3 $\sigma$ level of the N₂D⁺ condensations N and S (see Fig. 1), are shown. The other symbols have the same meaning as in the left panel of Fig. 1. The continuum source identified in Fig. 1 as C3 is out of the box.
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In the text