Image Details
Caption: Figure 1.
Location of observed sources (shown as stars) with the column density of molecular hydrogen toward Orion A (D. Polychroni et al. 2013, the Herschel Gould Belt Survey Archive). The molecular hydrogen column density, N(H2), contours start at 1 × 1022 cm−2 with a contour step of 5 × 1022 cm−2.
© 2026. The Author(s). Published by the American Astronomical Society.