CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

Nitrogen hydrides in interstellar gas Herschel/HIFI observations towards G10.6-0.4 (W31C)

Carina M. Persson (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; John H. Black (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; 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 ; Pasadena C. A. Anal ; Large Atacama
Astronomy & Astrophysics (0004-6361). Vol. 521 (2010), p. Article Number: L45 .
[Artikel, refereegranskad vetenskaplig]

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(-1) are estimated. The similar profiles suggest fairly uniform abundances relative to hydrogen, approximately 6 x 10(-9), 3 x 10(-9), and 3 x 10(-9) for NH, NH2, and NH3, respectively. These abundances are discussed with reference to models of gas-phase and surface chemistry.

Nyckelord: astrochemistry, ISM: abundances, ISM: molecules, molecular processes, submillimetre: ISM, line: formation, molecular absorption, sight-line, clouds, nh, chemistry, diffuse, regions, sagittarius-b2, submillimeter, spectroscopy



Denna post skapades 2010-12-27. Senast ändrad 2014-09-02.
CPL Pubid: 131889

 

Läs direkt!

Lokal fulltext (fritt tillgänglig)

Länk till annan sajt (kan kräva inloggning)