Wide-field rest-frame UV and continuum maps of COS2987 and surrounding regions. (a) Left panel: HST F160W-band image in a 6″ × 6″ region containing the central source and the candidate [C II] emitters (see Section 3.1). The [C II] moment-0 map is overlaid in black contours represented by the significance levels of 2-, 3-, 4-, 5-, 6-σ. (b) Right panel: Continuum map of the COS2987 field. The black lines correspond to the continuum significance levels from 2- to 7-σ at steps of 1-σ. In the bottom left panel within the main panel, we zoom in the central source in a 4″ × 4″ region. The overlaid white lines represent the [C II] moment-0 map for the significance levels from 2- to 6-σ, at steps of 1-σ.