Free Access

Table 2

Observed transitions and observational parameters.

Transition Frequency HPBW channel spacing η MB B μ
(GHz) (′′) (kHz) (km   s-1) (MHz) (D)

N2D+ (3–2) 231.3219119 27.0 76.29 0.0989 0.75 38 554.719 3.4
N2H+ (3–2) 279.511862 22.3 76.29 0.0818 0.74 46 586.867 3.4

Notes.ηMB is the main-beam efficiency of the APEX telescope, B is the rotational constant of the molecule, and μ is the dipole moment of the molecule.

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.