论文标题
与超新星残留W28相互作用的分子气体的亚毫米计观测
Submillimeter observations of molecular gas interacting with the supernova remnant W28
论文作者
论文摘要
上下文：超新星（SNE）将大量能量和化学丰富的材料注入周围的星际介质，并在某些情况下将其注入分子云（MCS）。超新星残留物（SNR）与MC的相互作用在云的物理和化学特性的进化中起着至关重要的作用。尽管它们的重要性，但仅进行了少量研究，以解决SNR影响的MC的分子丰富度。 （子）SNR-MC的毫米波长观测值可用于建立其分子丰富性的普查，这反过来又可以激励各种化学和物理模型，旨在解释云的化学演化。 目的：我们对邻接SNR W28的区域进行了多分子/多转移观测。我们使用检测线来限制该区域的物理条件。 方法：我们使用Apex望远镜观察频率的分子线，从$ 213 \ rm { - } 374 \，\ textrm {ghz} $。我们使用非LTE Radex建模来解释观察数据。 结果：我们发现了多种分子物种的发射，即ch $ _ {3} $哦，h $ _ {2} $ CO，SO，SIO，CN，CCH，CCH，NO，CS，HCO $^+$，HCN，HNC，HNC，N $ _2 $ H $ H $ H $ h $^+$，以及来自某些的Isotopologeuse。我们报告了第一次检测热激发（非Maser）ch $ _ {3} $ OH向SNR发射。 Employing non-LTE RADEX modeling of multiple H$_{2}$CO and CH$_{3}$OH lines, we constrain the kinetic temperature from 60 to 100$\,$K and the gas density from $9\times 10^{5}$ to $5\times 10^{6}\,\rm cm^{-3}$.我们获得了H $ _ {2} $ CO的Ortho-Para比率$ \ sim $ 2，这表明甲醛很可能是在灰尘谷物表面上形成的。 结论：我们的结果表明，在SNR-MC交互中可以检测到像H $ _ {2} $ CO和CH $ _ {3} $ oh一样复杂的分子。这可以激发化学建模以探索其形成途径。
Context: Supernovae (SNe) inject large amounts of energy and chemically enriched materials into their surrounding interstellar medium and, in some instances, into molecular clouds (MCs). The interaction of a supernova remnant (SNR) with a MC plays a crucial role in the evolution of the cloud's physical and chemical properties. Despite their importance, only a handful of studies have been made addressing the molecular richness in MCs impacted by SNRs. (Sub)millimter wavelength observations of SNR-MC can be used to build a census of their molecular richness, which in turn can motivate various chemical and physical models aimed at explaining the chemical evolution of the clouds. Aims: We carried out multi-molecule/multi-transition observations toward the region F abutting the SNR W28. We used the detected lines to constrain the physical conditions of this region. Methods: We used the APEX Telescope to observe molecular lines in the frequency from $213\rm{-}374\, \textrm{GHz}$. We used non-LTE RADEX modeling to interpret the observational data. Results: We detected emission from multiple molecular species, namely CH$_{3}$OH, H$_{2}$CO, SO, SiO, CN, CCH, NO, CS, HCO$^+$, HCN, HNC, N$_2$H$^+$, CO, and from isotopologues of some of them. We report the first detection of thermally excited (non-maser) CH$_{3}$OH emission toward a SNR. Employing non-LTE RADEX modeling of multiple H$_{2}$CO and CH$_{3}$OH lines, we constrain the kinetic temperature from 60 to 100$\,$K and the gas density from $9\times 10^{5}$ to $5\times 10^{6}\,\rm cm^{-3}$. We obtained an ortho-para ratio $\sim$2 for H$_{2}$CO, which indicates that formaldehyde is most likely formed on dust grain surfaces. Conclusions: Our results show that molecules as complex as H$_{2}$CO and CH$_{3}$OH can be detected in SNR-MC interactions. This could motivate chemical modelling to explore their formation pathways.
