Ionized and molecular gas in zC-400569 at z ≃ 2.24. The HST/WFC3 image in the NIR F160W filter (gray colorscale) is overlaid with Hα emission (red contours), CO(3 − 2) emission (blue contours), and CO(4 − 3) emission (cyan contours). Arrows indicate two possible dwarf companions (“A” and “B”), which are bright in Hα but undetected in CO and [N II] lines, suggesting low metallicities.