Image Details
Caption: Figure 11.
Projected velocity maps for inflowing and outflowing O VI-emitting gas in the Maelstrom halo (edge-on). Each panel shows the same projected map of pixel-by-pixel velocity differences between inflowing and outflowing O VI-emitting gas in the Maelstrom halo (as in the bottom-right panel of Figure 10), but filtered by different kinematic resolution thresholds: 300, 200, 100, and 30 km s−1 (top left to bottom right). The grayscale background represents the full ∣〈vin〉 − 〈vout〉∣ values. Colored pixels highlight regions where the velocity difference exceeds the corresponding kinematic resolution, indicating that an instrument with that velocity resolution could distinguish inflow from outflow in those areas. Gray regions fall below the resolution threshold and would be kinematically unresolved. The maps demonstrate that increasingly finer kinematic resolution enables inflow–outflow separation across larger fractions of the halo, emphasizing the importance of ≤30 km s−1 velocity resolution for resolving CGM gas flows in emission.
© 2026. The Author(s). Published by the American Astronomical Society.