Image Details
Caption: Figure 1.
Face-on H I column density maps for the FOGGIE Squall halo within a 100 kpc box. Top: all gas contributing to the H I column density. Bottom: map after removing the H I disk component. Some H I remains visible in the inner region after removing the disk; this gas is not part of the disk but lies in front of or behind it along the line of sight. This figure illustrates how removing the dense H I disk reveals surrounding gas structures and helps isolate CGM features from the disk.
© 2026. The Author(s). Published by the American Astronomical Society.