Fig. 2
Infrared spectra at the wavelengths of the vibrational transitions from the rotational ground levels of H
isotopologues. None of the lines are positively detected. H2D+ transitions were observed by iSHELL at the IRTF, and D
was observed by EXES on SOFIA. The velocity interval containing previously observed systemic velocities of CRL 2136 IRS 1 (15–35 km s−1) is indicated by dotted vertical lines.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.