Peer-Reviewed Journal Details
Mandatory Fields
Ossenkopf, V;Muller, HSP;Lis, DC;Schilke, P;Bell, TA;Bruderer, S;Bergin, E;Ceccarelli, C;Comito, C;Stutzki, J;Bacman, A;Baudry, A;Benz, AO;Benedettini, M;Berne, O;Blake, G;Boogert, A;Bottinelli, S;Boulanger, F;Cabrit, S;Caselli, P;Caux, E;Cernicharo, J;Codella, C;Coutens, A;Crimier, N;Crockett, NR;Daniel, F;Demyk, K;Dieleman, P;Dominik, C;Dubernet, ML;Emprechtinger, M;Encrenaz, P;Falgarone, E;France, K;Fuente, A;Gerin, M;Giesen, TF;di Giorgio, AM;Goicoechea, JR;Goldsmith, PF;Gusten, R;Harris, A;Helmich, F;Herbst, E;Hily-Blant, P;Jacobs, K;Jacq, T;Joblin, C;Johnstone, D;Kahane, C;Kama, M;Klein, T;Klotz, A;Kramer, C;Langer, W;Lefloch, B;Leinz, C;Lorenzani, A;Lord, SD;Maret, S;Martin, PG;Martin-Pintado, J;McCoey, C;Melchior, M;Melnick, GJ;Menten, KM;Mookerjea, B;Morris, P;Murphy, JA;Neufeld, DA;Nisini, B;Pacheco, S;Pagani, L;Parise, B;Pearson, JC;Perault, M;Phillips, TG;Plume, R;Quin, SL;Rizzo, R;Rollig, M;Salez, M;Saraceno, P;Schlemmer, S;Simon, R;Schuster, K;van der Tak, FFS;Tielens, AGGM;Teyssier, D;Trappe, N;Vastel, C;Viti, S;Wakelam, V;Walters, A;Wang, S;Whyborn, N;van der Wiel, M;Yorke, HW;Yu, S;Zmuidzinas, J
2010
July
Astronomy and Astrophysics
Detection of interstellar oxidaniumyl: Abundant H2O+ towards the star-forming regions DR21, Sgr B2, and NGC6334
Published
45 ()
Optional Fields
LASER MAGNETIC-RESONANCE ROTATIONAL SPECTRUM COMET-KOHOUTEK GROUND-STATE SPECTROSCOPY ABSORPTION OH IDENTIFICATION EMISSION NGC-6334
518
Aims. We identify a prominent absorption feature at 1115 GHz, detected in first HIFI spectra towards high-mass star-forming regions, and interpret its astrophysical origin. Methods. The characteristic hyperfine pattern of the H2O+ ground-state rotational transition, and the lack of other known low-energy transitions in this frequency range, identifies the feature as H2O+ absorption against the dust continuum background and allows us to derive the velocity profile of the absorbing gas. By comparing this velocity profile with velocity profiles of other tracers in the DR21 star-forming region, we constrain the frequency of the transition and the conditions for its formation. Results. In DR21, the velocity distribution of H2O+ matches that of the [C II] line at 158 mu m and of OH cm-wave absorption, both stemming from the hot and dense clump surfaces facing the H II-region and dynamically affected by the blister outflow. Diffuse foreground gas dominates the absorption towards Sgr B2. The integrated intensity of the absorption line allows us to derive lower limits to the H2O+ column density of 7.2 x 10(12) cm(-2) in NGC 6334, 2.3 x 10(13) cm(-2) in DR21, and 1.1 x 10(15) cm(-2) in Sgr B2.
LES ULIS CEDEX A
0004-6361
10.1051/0004-6361/201014577
Grant Details