| Autor: |
Gerin, Maryvonne, De Luca, M., Black, John, Herbst, Eric, Goicoechea, Javier R., Falgarone, Edith, Godard, Benjamin, Pearson, John C., Lis, Dariucz C., Phillips, Thomas G., Bell, Thomas A., Sonnentrucker, Paule, Boulanger, Francois, Cernicharo, José, Coutens, Audrey, Dartois, Emmanuel, Encrenaz, Pierre, Giesen, Thomas, Goldsmith, Paul F., Gupta, Harshal, Gry, Cecile, Hennebelle, Patrick, Hily-Blant, Pierre, Joblin, Christine, Kazmierczak, Maja, Kolos, Robert, Krelowski, Jacek, Martin-Pintado, Jesus, Monje, Raquel, Mookerjea, Bhaswati, Pérault, Michel, Persson, Carina, Plume, René, Rimmer, Paul B., Salez, Morvan, Schmidt, Mirisloaw, Teyssier, David, Vastel, Charlotte, Yu, Shan Shan, Contursi, Alessandra, Menten, Karl, Geballe, Thomas, Schlemmer, Stephan, Shipman, Russ, Tielens, Alexander G. G. M., Philipp-May, Sabine, Cros, Alain, Zmuidzinas, Jonas, Samoska, L. A, Klein, K., Neufeld, D. A., Lorenzani, A., Stutzki, Jürgen |
| Rok vydání: |
2010 |
| Předmět: |
|
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1051/0004-6361/201014576 |
| Popis: |
We report the detection of absorption lines by the reactive ions OH+, H2O+ and H3O+ along the line of sight to the submillimeter continuum source G10.6$-$0.4 (W31C). We used the Herschel HIFI instrument in dual beam switch mode to observe the ground state rotational transitions of OH+ at 971 GHz, H2O+ at 1115 and 607 GHz, and H3O+ at 984 GHz. The resultant spectra show deep absorption over a broad velocity range that originates in the interstellar matter along the line of sight to G10.6$-$0.4 as well as in the molecular gas directly associated with that source. The OH+ spectrum reaches saturation over most velocities corresponding to the foreground gas, while the opacity of the H2O+ lines remains lower than 1 in the same velocity range, and the H3O+ line shows only weak absorption. For LSR velocities between 7 and 50 kms$^{-1}$ we estimate total column densities of $N$(OH+) $> 2.5 \times 10^{14}$ cm$^{-2}$, $N$(H2O+) $\sim 6 \times 10^{13}$ cm$^{-2}$ and $N$(H3O+) $\sim 4.0 \times 10^{13}$ cm$^{-2}$. These detections confirm the role of O$^+$ and OH$^+$ in initiating the oxygen chemistry in diffuse molecular gas and strengthen our understanding of the gas phase production of water. The high ratio of the OH+ by the H2O+ column density implies that these species predominantly trace low-density gas with a small fraction of hydrogen in molecular form. |
| Databáze: |
arXiv |
| Externí odkaz: |
|
