Image Details
Caption: Figure 2.
H13CO+ 1-0 (blue) and C18O 2-1 (black, convolved to the spatial resolution of H13CO+) spectra toward NGC 1333-IRAS4A. The purple line shows the best Gaussian fit to the C18O line correcting for absorption. The spectra in each panel are offset by half θmaj for the H13CO+ observations.
© 2026. The Author(s). Published by the American Astronomical Society.