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首页> 外文期刊>The Astrophysical journal >LARGE-SCALE ~(13)CO J = 5 → 4 AND [C Ⅰ] MAPPING OF ORION A
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LARGE-SCALE ~(13)CO J = 5 → 4 AND [C Ⅰ] MAPPING OF ORION A

机译：大型〜（13）CO J = 5→4和[CⅠ]映射猎户座A

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摘要

We present maps of the ~(13)CO J = 5 → 4 (551 GHz) and [C Ⅰ] ~3P_1 → ~3P_0 (492 GHz) emission in the Orion A molecular cloud, covering a 0.5° x 2° area. A large velocity gradient (LVG) analysis of ~(13)CO J = 5 → 4 and J = 1 → 0 suggests that the gas temperatures in the northern part of OMC-1 (north of Δδ = -20′) are ～45 K and are, on average, at least 20 K higher than those to the south. The average ~(13)CO column density is log (N/cm~(-2)) = 16.4 ± 0.3 and is fairly constant throughout the cloud, even in the low-temperature region south of BN/KL. LVG modeling of the [C Ⅰ] emission shows a typical C~0 column density of 2 x 10~(17) cm~(-2), which yields a C/CO abundance ratio in the cloud of ～0.1 (rising to levels in excess of 0.5 at the cloud edges). Comparison of the Δ-variance (which measures spatial structure in a manner similar to a power spectrum) of the Submillimeter Wave Astronomy Satellite [C Ⅰ], Five College Radio Astronomy Observatory ~(13)CO J = 1 → 0, and CS J = 1 → 0 velocity-integrated maps suggests that the [C Ⅰ] and ~(13)CO emission arise from the same gas. In contrast, the CS emission likely originates in gas that is considerably more clumpy.
机译：我们给出了Orion A分子云中〜（13）CO J = 5→4（551 GHz）和[CⅠ]〜3P_1→〜3P_0（492 GHz）发射的图，覆盖了0.5°x 2°区域。对〜（13）CO J = 5→4和J = 1→0的大速度梯度（LVG）分析表明，OMC-1北部（Δδ= -20'北部）的气体温度为〜45钾，平均比南部的高至少20K。 〜（13）CO的平均柱密度为log（N / cm〜（-2））= 16.4±0.3，即使在BN / KL以南的低温地区，整个云层也相当恒定。 [CⅠ]发射的LVG模型显示典型的C〜0柱密度为2 x 10〜（17）cm〜（-2），在云中产生的C / CO丰度比为〜0.1（上升到水平）。在云边缘超过0.5）。亚毫米波天文学卫星[CⅠ]，五个大学射电天文台〜（13）CO J = 1→0和CS J的Δ-方差（以类似于功率谱的方式测量空间结构）的比较。 = 1→0速度积分图表明[CⅠ]和〜（13）CO的排放源于同一气体。相比之下，CS排放可能源自块状气体。

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