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Nitrogen hydrides in interstellar gas: Herschel/HIFI observations towards G10.6-0.4 (W31C) | | C.M. Persson
; J.H. Black
; J. Cernicharo
; J.R. Goicoechea
; G.E. Hassel
; E. Herbst
; M. Gerin
; M. De Luca
; T.A. Bell
; A. Coutens
; E. Falgarone
; P.F. Goldsmith
; H. Gupta
; M. Kazmierczak
; D.C. Lis
; B. Mookerjea
; D.A. Neufeld
; J. Pearson
; T.G. Phillips
; P. Sonnentrucker
; J. Stutzki
; C. Vastel
; S. Yu
; F. Boulanger
; E. Dartois
; P. Encrenaz
; T.R. Geballe
; T. Giesen
; B. Godard
; C. Gry
; P. Hennebelle
; P. Hily-Blant
; C. Joblin
; R. Kolos
; J. Krelowski
; J. Martin-Pintado
; K. Menten
; R. Monje
; M. Perault
; R. Plume
; M. Salez
; S. Schlemmer
; M. Schmidt
; D. Teyssier
; I. Peron
; P. Cais
; P. Gaufre
; A. Cros
; L. Ravera
; P. Morris
; S. Lord
; P. Planesas
; | | Date: |
15 Jul 2010 | | Abstract: | The HIFI instrument on board the Herschel Space Observatory has been used to
observe interstellar nitrogen hydrides along the sight-line towards G10.6-0.4
in order to improve our understanding of the interstellar chemistry of
nitrogen. We report observations of absorption in NH N=1-0, J=2-1 and ortho-NH2
1_1,1-0_0,0. We also observed ortho-NH3 1_0-0_0, and 2_0-1_0, para-NH3 2_1-1_1,
and searched unsuccessfully for NH+. 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. All spectra
show similar, non-saturated, absorption features, which we attribute to diffuse
molecular gas. Total column densities over the velocity range 11-54 km/s are
estimated. The similar profiles suggest fairly uniform abundances relative to
hydrogen, approximately 6*10^-9, 3*10^-9, and 3*10^-9 for NH, NH2, and NH3,
respectively. These abundances are discussed with reference to models of
gas-phase and surface chemistry. | | Source: | arXiv, 1007.2550 | | Services: | Forum | Review | PDF | Favorites | |
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