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Nitrogen hydrides in interstellar gas towards G10.6-0.4 (W31C) and W49N

Carina M. Persson (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; Massimo De Luca ; Bhaswati Mookerjea ; Maryvonne Gerin ; John H. Black (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; Tom Bell ; Benjamin Godard ; Javier, R. Goicoechea ; G. Hassel ; Eric Herbst ; Pierre Hily-Blant ; Karl, M. Menten ; Holger S.P. Muller ; Henrik Olofsson (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; John C. Pearson ; Shanshan Yu
IAU Symposium 280, Poster 76, Session 2, The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Toledo, Spain, May 30-June 3, 2011, #296 Vol. 280 (2011), 76,
[Konferensbidrag, poster]

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-NH2 111-000, ortho-NH3 10-00 and 20-10, para-NH3 21-11 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, NH2 and NH3 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.

Denna post skapades 2011-11-08. Senast ändrad 2014-09-02.
CPL Pubid: 148266