Herschel observations of deuterated water towards Sgr B2(M)
Max-Planck-Institut für Radioastronomie（马克斯·普朗克射电天文研究所）；I. Physikalisches Institut, Universität zu Köln（科隆大学第一物理研究所）；California Institute of Technology（加州理工学院）；Department of Astronomy, University of Michigan（密歇根大学天文学系）
Claudia Comito, Peter Schilke, Rainer Rolffs, D. C. Lis, A. Belloche, E. A. Bergin, T. G. Phillips, T. A. Bell, N. R. Crockett, S. Wang, G. A. Blake, E. Caux, C… 展开作者
Claudia Comito, Peter Schilke, Rainer Rolffs, D. C. Lis, A. Belloche, E. A. Bergin, T. G. Phillips, T. A. Bell, N. R. Crockett, S. Wang, G. A. Blake, E. Caux, C. Ceccarelli, J. Cernicharo, F. Daniel, M. -L. Dubernet, M. Emprechtinger, P. Encrenaz, M. Gerin, T. F. Giesen, J. R. Goicoechea, P. F. Goldsmith, H. Gupta, E. Herbst, C. Joblin, D. Johnstone, W. D. Langer, W. D. Latter, S. D. Lord, S. Maret, P. G. Martin, G. J. Melnick, K. M. Menten, P. Morris, H. S. P. Mueller, J. A. Murphy, D. A. Neufeld, V. Ossenkopf, J. C. Pearson, M. Perault, R. Plume, S. -L. Qin, S. Schlemmer, J. Stutzki, N. Trappe, F. F. S. van der Tak, C. Vastel, H. W. Yorke, S. Yu, M. Olberg, R. Szczerba, B. Larsson, R. Liseau, R. H. Lin, L. A. Samoska, E. Schlecht
Observations of HDO are an important complement for studies of water, because they give strong constraints on the formation processes -- grain surfaces versus energetic process in the gas phase, e.g. in shocks. The HIFI observations of multiple transitions of HDO in Sgr~B2(M) presented here allow the determination of the HDO abundance throughout the envelope, which has not been possible before with ground-based observations only. The abundance structure has been modeled with the spherical Monte Carlo radiative transfer code RATRAN, which also takes radiative pumping by continuum emission from dust into account. The modeling reveals that the abundance of HDO rises steeply with temperature from a low abundance ($2.5\times 10^{-11}$) in the outer envelope at temperatures below 100~K through a medium abundance ($1.5\times 10^{-9}$) in the inner envelope/outer core, at temperatures between 100 and 200~K, and finally a high abundance ($3.5\times 10^{-9}$) at temperatures above 200~K in the hot core.
Warm ISM in the Sgr A Complex. I: Mid-J CO, atomic carbon, ionized atomic carbon,and ionized nitrogen sub-mm/FIR line observations with the Herschel-HIFI and NANTEN2/SMART telescopes
Herschel water maps towards the vicinity of the black hole Sgr A*
目的：研究银河系中心（GC）围绕Sgr A* 的~64 pc $^2$区域水辐射的空间分布和运动学。我们还分析了水的激发，推导出的物理条件和水的丰度在CND和“静止的云”。研究方法：我们提出了积分强度图的邻1 $_{10}-1_{01}$，和对位2 $_{02}-1_{11}$和1 $_{11}-0_{00}$水跃迁观察与Herschel的HIFI仪器。为了研究水的激发，我们使用基态邻位和对位H $_2^{18}$ O跃迁。在我们的研究中，我们还使用了SPIRE连续测量的CND。使用非LTE辐射传输代码，水线剖面和灰尘连续体进行了建模。我们还使用了一个旋转环模型，以再现CND运动学的PV图所表示的。结果：我们确定的水排放所产生的CND，西方流光，和20和50公里的$^{-1}$云。正交水图显示了[-220，10] km s $^{-1}$范围内的吸收结构。PV图显示2 $_{02}-1_{11}$ H $_2$ O发射跟踪CND。计算了CND云的高X $_{H_2O}$为$\sim$（0.1-1.3）$\times$ 10 $^{-5}$，VPDMATHABMX为14-23 km s $^{-1}$，TPDMATHABMY为15-45 K，20 km s $^{-1}$云的低X $_{\rm H_2O}$为4 $\times$ 10 $^{-8}$，VPDMATHABMX为9 km…
Reversal of infall in SgrB2(M) revealed by Herschel/HIFI observations of HCN lines at THz frequencies
Max-Planck-Institut für Radioastronomie（马克斯·普朗克射电天文研究所）；I. Physikalisches Institut, Universität zu Köln（科隆大学第一物理研究所）；Department of Astronomy, University of Michigan（密歇根大学天文学系）；SRON Netherlands Institute for Space Research（荷兰空间研究所）；California Institute of Technology（加州理工学院）
Deuterated water in the solar-type protostars NGC 1333 IRAS 4A and IRAS 4B
Aims. The aim of this paper is to study deuterated water in the solar-type protostars NGC1333 IRAS4A and IRAS4B, to compare their HDO abundance distribution with other star-forming regions, and to constrain their HDO/H2O ratios. Methods. Using the Herschel/HIFI instrument as well as ground-based telescopes, we observed several HDO lines covering a large excitation range (Eup/k=22-168 K) towards these protostars and an outflow position. Non-LTE radiative transfer codes were then used to determine the HDO abundance profiles in these sources. Results. The HDO fundamental line profiles show a very…
Herschel observations of extra-ordinary sources: Detection of Hydrogen Fluoride in absorption towards Orion~KL
University of Michigan（密歇根大学）；California Institute of Technology（加州理工学院）；Johns Hopkins University（约翰斯·霍普金斯大学）；Université de Toulouse [UPS]（图卢兹大学）；CNRS/INSU（法国国家科学研究中心/地球科学与宇宙学研究所）
