Extended Far-Infrared CO Emission in the OMC-1 Core of Orion
Extended Far-Infrared CO Emission in the OMC-1 Core of Orion
复制标题
Orion 的 OMC-1 核心中的扩展远红外 CO 发射
作者：
M. J. Sempere;J. Cernicharo;B. Lefloch;E. González;S. Leeks
我们报告敏感的远红外观测12 CO纯转动跃迁的OMC-1核心的猎户座。这些谱线是用红外空间观测站上的长波长分光仪以光栅模式观测的，覆盖43-197微米波长范围。从Jup = 14到Jup = 19的跃迁已经在整个OMC-1堆芯中被识别出来，并且已经在中心区域KL/IRc 2检测到Jup = 43的谱线。此外，我们已经采取了高质量的光谱中的法布里-珀罗模式的一些CO线。在KL/IRc 2中，用一个描述平台和脊发射的三温度模型满意地解释了这些谱线。在高J跃迁（Jup > 34）中检测到的通量揭示了一种非常热和致密的气体成分[T = 1500-2500 K; N（CO）= 2 × 1017 cm-2]的存在，可能源自以前在H2近红外线中观察到的一些嵌入源。在OMC-1核心的所有其他位置，我们估计动力学温度≥80 K和高达150 K在IRc 2周围的一些位置，从一个简单的大速度梯度模型。
We report on sensitive far-infrared observations of 12CO pure rotational transitions in the OMC-1 core of Orion. The lines were observed with the long-wavelength spectrometer in the grating mode on board the Infrared Space Observatory, covering the 43-197 μm wavelength range. The transitions from Jup = 14 up to Jup = 19 have been identified across the whole OMC-1 core, and lines up to Jup = 43 have been detected toward the central region, KL/IRc2. In addition, we have taken high-quality spectra in the Fabry-Perot mode of some of the CO lines. In KL/IRc2, the lines are satisfactorily accounted for by a three-temperature model describing the plateau and ridge emission. The fluxes detected in the high-J transitions (Jup > 34) reveal the presence of a very hot and dense gas component [T = 1500-2500 K; N(CO) = 2 × 1017 cm-2], probably originating from some of the embedded sources previously observed in the H2 near-infrared lines. At all other positions in the OMC-1 core, we estimate kinetic temperatures ≥80 K and as high as 150 K at some positions around IRc2, from a simple large-velocity gradient model.