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Fig. 1

image

Leftpanel: ALMA 1.3 mm continuum emission, shown in green contours with levels of 5σ (dark green), 10σ, 30σ, 50σ, 70σ (and thereafter increasing by increments of 50σ, where σ = 0.3 mJy bm−1 corresponds to rms noise in a signal-free region). Gray and black contours show N2H+ emission at levels of 5σ and 10σ, respectively. Dashed magenta boxes outline the regions shown in “zoom” in Fig. 2. Right panel: N2 H+ emission is shown with grayscale (as well as contours as in left panel), zoomed out slightly from the region we mapped with ALMA in order to better display the dense gas filamentary structure of the region. Green contour shows lowest level (5σ) mm continuum emission as shown in left panel. Symbols indicate all identified sources in the region. Red (square, diamond, or circle) indicate a source detected with ALMA. Purple (star, cross, or plus) indicate sources identified by D15, but not detected with ALMA. In this display it is evident that the YSOs areforming in the dense filamentary region, with no mm sources detected in a region where N2 H+ emission is lower than5σ.

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