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在朝向Sgr B2（M）的旋臂云中正-和对-氧化铵基（H2O +）的Herschel观测

Herschel observations of ortho- and para-oxidaniumyl (H2O+) in spiral arm clouds toward Sgr B2(M)

P. Schilke, C. Comito, H. S. P. Mueller, E. A. Bergin, E. Herbst, D. C. Lis, D. A. Neufeld, T. G. Phillips, T. A. Bell, G. A. Blake, S. Cabrit, E. Caux, C. Cecc… 展开作者

P. Schilke, C. Comito, H. S. P. Mueller, E. A. Bergin, E. Herbst, D. C. Lis, D. A. Neufeld, T. G. Phillips, T. A. Bell, G. A. Blake, S. Cabrit, E. Caux, C. Ceccarelli, J. Cernicharo, N. R. Crockett, F. Daniel, M. -L. Dubernet, M. Emprechtinger, P. Encrenaz, M. ~Gerin, T. F. Giesen, J. R. Goicoechea, P. F. Goldsmith, H. Gupta, C. Joblin, D. Johnstone, W. D. Langer, W. B. Latter, S. D. Lord, S. Maret, P. G. Martin, G. J. Melnick, K. M. Menten, P. Morris, J. A. Murphy, V. Ossenkopf, L. Pagani, J. C. Pearson, M. Perault, R. Plume, S. -L. Qin, M. Salez, S. Schlemmer, J. Stutzki, N. Trappe, F. F. S. van der Tak, C. Vastel, S. Wang, H. W. Yorke, S. Yu, N. Erickson, F. W. Maiwald, J. Kooi, A. Karpov, J. Zmuidzinas, A. Boogert, R. Schieder, P. Zaal

备注：
A&A, HIFI special issue, accepted
发表信息：
Astron. Astrophys. 521 (2010) Art. No. L11
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摘要：

在靠近银河系中心的大质量恒星形成核心Sgr B2（M）中，观察到了H2O+的正态和对位态。观测结果显示，太阳和Sgr B2之间的所有旋臂云都有吸收。H_2O ~+在大多数速度区间的平均o/p比为4.8，对应的核自旋温度为21 K。讨论了该自旋温度与H2O+气体的形成温度和当前物理温度的关系，但没有得出确切的结论。在0至60公里/秒的速度间隔，低于单位的邻/对位比被发现，但如果这是由于人工污染的其他物种或真正的不清楚。

英文摘要：

H2O+ has been observed in its ortho- and para- states toward the massive star forming core Sgr B2(M), located close to the Galactic center. The observations show absorption in all spiral arm clouds between the Sun and Sgr B2. The average o/p ratio of H2O+ in most velocity intervals is 4.8, which corresponds to a nuclear spin temperature of 21 K. The relationship of this spin temperature to the formation temperature and current physical temperature of the gas hosting H2O+ is discussed, but no firm conclusion is reached. In the velocity interval 0 to 60 km/s, an ortho/para ratio of below unity is found, but if this is due to an artifact of contamination by other species or real is not clear.

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