arXiv 1702.050962017-02-16astro-ph.SRastro-ph.GA

深入喷泉：IRAS 18043-2116案

Deep into the Water Fountains: The case of IRAS 18043-2116

A. F. Pérez-Sánchez, D. Tafoya, R. García López, W. Vlemmings, L. F. Rodríguez

备注：: 10 pages, 5 figures. Accepted for publication in A&A
发表信息：: A&A 601, A68 (2017)
DOI：: 10.1051/0004-6361/201630267

摘要：

在后渐近巨星分支（post-AGB）恒星的星周包层（CSE）中，大尺度（数百到数千AU）双极结构的形成知之甚少。这些结构的形状，从快速分子流出的发射跟踪，表明在这些CSE的最里面的区域的动力学并不只取决于中央恒星的辐射场的能量。深入喷泉是一个观测项目，基于三个望远镜设施进行的项目结果：卡尔G。Jansky甚大望远镜阵（JVLA）、澳大利亚望远镜紧凑阵（ATCA）和甚大望远镜（SINFONI-VLT）。本文报道对WF星云IRAS 18043 $-$ 2116的观测结果：在1.5GHz - 8.0GHz频率范围内探测到射电连续辐射，在22 GHz探测到H $_{2}$ O脉泽光谱特征和射电连续辐射，在近红外探测到H $_{2}$振转辐射线。高速H $_{2}$ O脉泽的光谱特征和探测到的激波激发H $_{2}$发射可能产生于喷流驱动风传播的结果而被扫起的分子层中。使用导出的H $_{2}$柱密度，我们估计了$10^{-9}$ M $_{\odot}$ yr $^{-1}$数量级的分子质量损失率。另一方面，如果所检测到的无线电连续通量是由于热无线电喷流的传播而产生的，则与流出的电离物质相关的质量损失率为10 $^{-5}$ M $_{\odot}$ yr $^{-1}$的量级。旋转圆盘的存在可能是对估计的质量损失率的合理解释。

英文摘要：

(Abridged) The formation of large-scale (hundreds to few thousands of AU) bipolar structures in the circumstellar envelopes (CSEs) of post-Asymptotic Giant Branch (post-AGB) stars is poorly understood. The shape of these structures, traced by emission from fast molecular outflows, suggests that the dynamics at the innermost regions of these CSEs does not depend only on the energy of the radiation field of the central star. Deep into the Water Fountains is an observational project based on the results of programs carried out with three telescope facilities: The Karl G. Jansky Very Large Array (JVLA), The Australia Telescope Compact Array (ATCA), and the Very Large Telescope (SINFONI-VLT). Here we report the results of the observations towards the WF nebula IRAS 18043$-$2116: Detection of radio continuum emission in the frequency range 1.5GHz - 8.0GHz; H$_{2}$O maser spectral features and radio continuum emission detected at 22GHz, and H$_{2}$ ro-vibrational emission lines detected at the near infrared. The high-velocity H$_{2}$O maser spectral features, and the shock-excited H$_{2}$ emission detected could be produced in molecular layers which are swept up as a consequence of the propagation of a jet-driven wind. Using the derived H$_{2}$ column density, we estimated a molecular mass-loss rate of the order of $10^{-9}$M$_{\odot}$yr$^{-1}$. On the other hand, if the radio continuum flux detected is generated as a consequence of the propagation of a thermal radio jet, the mass-loss rate associated to the outflowing ionized material is of the order of 10$^{-5}$M$_{\odot}$yr$^{-1}$. The presence of a rotating disk could be a plausible explanation for the mass-loss rates estimated.

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