Image Details
Caption: Figure 2.
Neutral hydrogen maps for shells GSH 052+10−087 (top), and GSH 179−24+012 (bottom). Each shell is shown at its reference velocity. Darker shadings indicate regions of greater H I emission. The dashed line for GSH 179−24+012 indicates the extent of the shell in places where confusion might otherwise occur.
© 2015. The American Astronomical Society. All rights reserved.