Upper panel: spectrum of the SPW 5 in correspondence with the continuum peak in A1N. The strong and wide H30α line is labeled. Central panel: channel maps at different velocities across the H30α line width, showing the compact structure of the emission. The more diffuse emission is mostly due to two weak CH3OCHO lines. In all panels, the green contour is the 5σ threshold (5 mJy beam−1) of the ALMA 1.4 mm continuum. In the central panel, the white contours reproduce the JVLA A-Array 1.3 cm continuum, plotting levels from 0.1 to 16, by 3 mJy beam−1. Lower panel: plot of channel VLSR vs. corresponding peak positions, projected along the major axis of the peak distribution at PA = 39°. Black vertical error bars are equal to the channel width of 0.6 km s−1; red horizontal error bars give the peak position errors, estimated with the expression (Reid et al. 1988): (Θ ∕2)(σ∕I), where Θ is the FWHM size of the observing beam, and I and σ are the peak intensity and the channel rms noise, respectively. The dashed line is a linear fit to the data. A lower limit to the size of the region harboring the VLSR gradient is indicated.
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