朝向G10.6-0.4视线方向上的星际OH+、H2O+和H3O+
星系天体物理
2015-05-19 v1
摘要
我们报告了在朝向亚毫米连续谱源G10.60.4 (W31C)的视线方向上探测到反应性离子OH+、H2O+和H3O+的吸收线。我们使用赫歇尔HIFI仪器以双波束开关模式观测了OH+在971 GHz、H2O+在1115和607 GHz以及H3O+在984 GHz的基态转动跃迁。所得光谱在宽速度范围内显示出深吸收，这些吸收起源于朝向G10.60.4视线方向上的星际物质以及与该源直接相关的分子气体。OH+光谱在对应于前景气体的大部分速度上达到饱和，而H2O+线的光深在同一速度范围内仍低于1，H3O+线仅显示出弱吸收。对于LSR速度在7到50 km s之间，我们估计总柱密度为(OH+) cm，(H2O+) cm和(H3O+) cm。这些探测证实了O和OH在启动弥漫分子气体中氧化学中的作用，并加强了我们对于水的气相产生的理解。OH+与H2O+柱密度的高比值表明这些物种主要示踪了低密度气体，其中氢分子形式所占比例很小。
引用
@article{arxiv.1005.5653,
title = {Interstellar OH+, H2O+ and H3O+ along the sight-line to G10.6-0.4},
author = {Maryvonne Gerin and M. De Luca and John Black and Eric Herbst and Javier R. Goicoechea and Edith Falgarone and Benjamin Godard and John C. Pearson and Dariucz C. Lis and Thomas G. Phillips and Thomas A. Bell and Paule Sonnentrucker and Francois Boulanger and José Cernicharo and Audrey Coutens and Emmanuel Dartois and Pierre Encrenaz and Thomas Giesen and Paul F. Goldsmith and Harshal Gupta and Cecile Gry and Patrick Hennebelle and Pierre Hily-Blant and Christine Joblin and Maja Kazmierczak and Robert Kolos and Jacek Krelowski and Jesus Martin-Pintado and Raquel Monje and Bhaswati Mookerjea and Michel Pérault and Carina Persson and René Plume and Paul B. Rimmer and Morvan Salez and Mirisloaw Schmidt and David Teyssier and Charlotte Vastel and Shan Shan Yu and Alessandra Contursi and Karl Menten and Thomas Geballe and Stephan Schlemmer and Russ Shipman and Alexander G. G. M. Tielens and Sabine Philipp-May and Alain Cros and Jonas Zmuidzinas and L. A Samoska and K. Klein and D. A. Neufeld and A. Lorenzani and Jürgen Stutzki},
journal= {arXiv preprint arXiv:1005.5653},
year = {2015}
}