论文标题
Q频段线调查使用Tianma射程望远镜对Orion KL
A Q-band line survey towards Orion KL using the Tianma radio telescope
论文作者
论文摘要
我们使用Tianma 65 m射电望远镜（TMRT）的Q波段接收器对Orion KL进行了线调查，覆盖34.8--50 GHz，速度分辨率分别在0.79 km S $^{ - 1} $和0.55 km S $ s $^{ - 1} $之间。观测值对1-8 MK的水平达到了敏感性，证明TMRT对进行深线调查很敏感。总共提取了597个高斯特征。其中，确定了177个无线电重组线（RRL），包括126、40和11 RRL的氢，氦气和碳，最大$ΔN$为16、7和3。碳RRL被确认起源于$ v _ {\ rm lsr} \ sim $ 9 km s $ s $^{ - 1} $。另外，发现了371个分子物种的分子跃迁。 Rizzo等人在Q波段中未牢固地检测到该调查的21种分子。 （2017年），包括H $ _2 $ CS，HCOOH，C $ _2 $ H $ _5 $ oh，H $ _2^{13} $ CO，H $ _2 $ CCO，CH $ _3 $ CHO，CH $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $，特别是，氰化物的振动激发态（c $ _2 $ h $ _5 $ cn $ v $ 13/$ v $ 21）是在Q乐队中首次牢固检测到的。确定了NH $ _3 $（15,15）和（16,16），到目前为止，它们是检测到Orion KL的NH $ _3 $反转线的最高过渡。所有确定的线都可以通过辐射转移模型再现。
We have conducted a line survey towards Orion KL using the Q-band receiver of Tianma 65 m radio telescope (TMRT), covering 34.8--50 GHz with a velocity resolution between 0.79 km s$^{-1}$ and 0.55 km s$^{-1}$ respectively. The observations reach a sensitivity on the level of 1-8 mK, proving that the TMRT is sensitive for conducting deep line surveys. In total, 597 Gaussian features are extracted. Among them, 177 radio recombination lines (RRLs) are identified, including 126, 40 and 11 RRLs of hydrogen, helium and carbon, with a maximum $Δn$ of 16, 7, and 3, respectively. The carbon RRLs are confirmed to originate from photodissociation regions with a $V_{\rm LSR}\sim$9 km s$^{-1}$. In addition, 371 molecular transitions of 53 molecular species are identified. Twenty-one molecular species of this survey were not firmly detected in the Q band by Rizzo et al. (2017), including species such as H$_2$CS, HCOOH, C$_2$H$_5$OH, H$_2^{13}$CO, H$_2$CCO, CH$_3$CHO, CH$_2$OCH$_2$, HCN $v_2=1$, and CH$_3$OCHO $v_t=1$. In particular, the vibrationally excited states of ethyl cyanide (C$_2$H$_5$CN $v$13/$v$21) are for the first time firmly detected in the Q band. NH$_3$ (15,15) and (16,16) are identified, and they are so far the highest transitions of the NH$_3$ inversion lines detected towards Orion KL. All the identified lines can be reproduced by a radiative transfer model.
