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Astron. Astrophys. 345, L43-L46 (1999)

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3. Results

Fig. 1 shows a contour map of the [FORMULA]mm continuum emission toward I20126. The emission is unresolved and the peak position, as determined from gaussian fitting is [FORMULA], [FORMULA], coincident with that of the [FORMULA]mm continuum measured by Cesaroni et al. (1997). The total flux density is [FORMULA]mJy.

[FIGURE] Fig. 1. Contour plot of the [FORMULA]mm continuum emission toward I20126 (solid contours). Contour levels are 1.5 to [FORMULA] by [FORMULA]mJy beam-1. The dashed contours show the continuum emission at [FORMULA]cm with contour levels 0.03 to [FORMULA] by [FORMULA]mJy beam-1. The filled triangles mark the position of the [FORMULA]GHz H2O masers from Tofani et al. (1995).

In the lower panel of Fig. 2 we show our uniformly weighted [FORMULA]cm continuum map in solid contours. We also show the position of the water masers measured by Tofani et al. (1995) as triangles and the peak positions of fits to channel maps of CH3CN(5-4) from Cesaroni et al. (1997) as circles. The [FORMULA]cm continuum emission consists of two clearly distinct sources, the northern one being coincident with H2O masers, CH3CN and mm continuum emission. Both sources are clearly resolved along their major axis, and appear to be aligned in the same direction with a position angle of [FORMULA]117o. This orientation is identical to the direction of the bipolar molecular flow imaged in the HCO+(1-0) transition by Cesaroni et al. (1997), which is shown in the upper panel. The H2O masers are coincident with the northern continuum source and are also aligned along this same angle. On the other hand the structure seen in CH3CN is oriented perpendicular to the [FORMULA]cm continuum emission.

[FIGURE] Fig. 2. Top panel: The bipolar molecular flow in I20126. Blue- and red-shifted HCO+(1-0) emission is shown in solid and dashed contours respectively. Emission from the H2 [FORMULA]S(0) vibrational line at [FORMULA]m is shown in grey scale (see Cesaroni et al. 1997for details). H2O masers are shown as filled triangles and the box shows the area seen enlarged below. Bottom Panel: [FORMULA]cm continuum emission (contours) with levels 0.05 to [FORMULA] by [FORMULA]mJy beam-1. The filled triangles mark the position of H2O masers and the open circles mark the peak position of gaussian fits to channel maps of the CH3CN(5-4) transition. The synthesized beam is shown in the bottom right corner.

In our uniformly weighted map we measure [FORMULA]cm flux densities of about [FORMULA]mJy and [FORMULA]mJy for the northern and southern components respectively. The northern component appears double peaked and can be well fitted with two unresolved sources of similar flux density. The southern component has a single peak; a 2-D gaussian fit shows that it is unresolved along the minor axis and has a deconvolved size of [FORMULA] along its major axis.

We also searched for [FORMULA]cm continuum emission at the position of the sources detected in the H2 NIR lines by Ayala et al. (1998). No additional sources where found with a [FORMULA] limit of [FORMULA]Jy beam-1.

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© European Southern Observatory (ESO) 1999

Online publication: April 28, 1999