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Fig. 4


Upper panel: the color map represents the ALMA 1.4 mm continuum, with the color-intensity scale shown in the wedge on the right of the panel. The magenta contour is the 5σ threshold of 5 mJy beam−1. The white contours reproduce the JVLA A-Array 1.3 cm continuum, plotting levels from 0.1 to 16, by 0.7 mJy beam−1. The insets in the right and left bottom corners of the plot report the ALMA and JVLA beams, respectively. Lower panel: spectrum (black error bars) and fit (black curve) of the continuum emission over the frequency range 1.4–225 GHz. The fluxes at 1.4, 4.9, and 8.4 GHz are from VLA observations not yet published (Cesaroni, private communication); fluxes at 24, 44, 214, and 225 GHz come from VLA B-Array (Beltrán et al. 2006), VLA A-Array (Beltrán et al. 2007), PdbI, and SMA (Beltrán et al. 2011) observations, respectively. We have fitted the continuum spectrum with a simple model of a spherical, homogeneous HII region: the derived radius and Lyman photon flux are reported at the top of the panel. The red error bar gives the ALMA 1.4 mm flux integrated over the HII region (delimited by the weakest white contour in the upper panel).

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