论文标题
HC $ _ {3} $ N与G24.78+0.08 A1 Hyper-Compact H $ _ {\ rm {II}} $区域相关的Hc $ _ {3} $ N的振动线
Vibrationally-excited Lines of HC$_{3}$N Associated with the Molecular Disk around the G24.78+0.08 A1 Hyper-compact H$_{\rm {II}}$ Region
论文作者
论文摘要
我们已经分析了Atacama大毫米/亚毫升阵列频段6个超压缩H $ _ {\ rm {ii}} $区域G24.78+0.08 A1（G24 HC H $ _ {\ rm {II}} $）的$ hccited-excited-hccited linced linced Line flice nc的a1; （$ v_ {7} = 2 $，$ j = 24-23 $）。 Hc $ _ {3} $ n（$ v_ {7} = 2 $，$ j = 24-23 $，$ l = 2e $）的HC $ _ {3} $ n（$ V_ HC $ _ {3} $ n排放正在追踪G24 HC H $ _ {\ rm {II}} $ region先前由CH $ _ {3} $ CN行识别的磁盘。我们得出了$^{13} $ ch $ _ {3} $ cn/hc $^{13} $ ccn的丰度比G24，并将它们与CH $ _ {3} $ _ {3} $ cn/hc $ _ {3} $ _ {3} $ n的丰富率在Herbig ae和Tauri周围的disks in Disks中。 The $^{13}$CH$_{3}$CN/HC$^{13}$CCN ratios around G24 ($\sim 3.0-3.5$) are higher than the CH$_{3}$CN/HC$_{3}$N ratios in the other disks ($\sim 0.03-0.11$) by more than one order of magnitude. G24周围较高的ch $ _ {3} $ cn/hc $ _ {3} $ n比率表明，在热量的气体中，ch $ _ {3} $ cn的热解（在热量的热量和有效破坏HC $ _ {3} $ n）中，该区域在该区域中受到了强烈的UV辐射的影响。我们的结果表明，在HC H $ _ {\ rm {ii}} $区域阶段，可以将振动激发的HC $ _ {3} $ n线用作大型原始物质的磁盘示踪剂，并且这些硝化物种的组合将提供不仅化学条件，但也将提供迪斯克结构的物理条件的信息。
We have analyzed Atacama Large Millimeter/submillimeter Array Band 6 data of the hyper-compact H$_{\rm {II}}$ region G24.78+0.08 A1 (G24 HC H$_{\rm {II}}$) and report the detection of vibrationally-excited lines of HC$_{3}$N ($v_{7}=2$, $J=24-23$). The spatial distribution and kinematics of a vibrationally-excited line of HC$_{3}$N ($v_{7}=2$, $J=24-23$, $l=2e$) are found to be similar to the CH$_{3}$CN vibrationally-excited line ($v_{8}=1$), which indicates that the HC$_{3}$N emission is tracing the disk around the G24 HC H$_{\rm {II}}$ region previously identified by the CH$_{3}$CN lines. We derive the $^{13}$CH$_{3}$CN/HC$^{13}$CCN abundance ratios around G24 and compare them to the CH$_{3}$CN/HC$_{3}$N abundance ratios in disks around Herbig Ae and T Tauri stars. The $^{13}$CH$_{3}$CN/HC$^{13}$CCN ratios around G24 ($\sim 3.0-3.5$) are higher than the CH$_{3}$CN/HC$_{3}$N ratios in the other disks ($\sim 0.03-0.11$) by more than one order of magnitude. The higher CH$_{3}$CN/HC$_{3}$N ratios around G24 suggest that the thermal desorption of CH$_{3}$CN in the hot dense gas and efficient destruction of HC$_{3}$N in the region irradiated by the strong UV radiation are occurring. Our results indicate that the vibrationally-excited HC$_{3}$N lines can be used as a disk tracer of massive protostars at the HC H$_{\rm {II}}$ region stage, and the combination of these nitrile species will provide information of not only chemistry but also physical conditions of the disk structures.
