Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.296p&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Astronomy and Astrophysics
Astronomy
Scientific paper
The PRISMAS key programme has used the HIFI instrument on board Herschel to observe interstellar nitrogen hydrides along the sight-lines towards G10.6-0.4 (W31C) and W49N in order to elucidate the production pathways leading to nitrogen bearing species. We report observations of the NH N=1-0, J=2-1 and J=1-0, ortho-NH_2 11,1-00,0, ortho-NH_3 1_0-0_0 and 2_0-1_0, para-NH_3 2_1-1_1 transitions, and unsuccessful searches for NH^+ in both sources. All detections show emission and absorption associated directly with the hot-core source itself as well as absorption by foreground material over a wide range of velocities. The NH, NH_2 and NH_3 spectra show strikingly similar and non-saturated absorption features, which we attribute to diffuse molecular gas. The similarity of the profiles suggest fairly uniform abundances relative to hydrogen. The derived relative and absolute abundances are discussed with reference to models of gas-phase and surface chemistry.
Bell Thomas A.
Black John Harry
de Luca Massimo
Gerin Maryvonne
Godard Benjamin
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