N2H+ and HC3N Observations of the Orion A Cloud
N2H+ and HC3N Observations of the Orion A Cloud
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DOI：
10.1093/pasj/60.3.407
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发表时间：
2008-04
影响因子：
2.3
通讯作者：
K. Tatematsu;R. Kandori;T. Umemoto;Y. Sekimoto
中科院分区：
文献类型：
--
作者：
K. Tatematsu;R. Kandori;T. Umemoto;Y. Sekimoto
猎户座A巨大分子云的"积分形偶极子“在N2 H+中被映射，其北方端，OMC-2/3区域也在HC 3 N和CCS中被观察到。N2 H+的分布类似于尘埃的连续分布，除了猎户座星云的中心部分。H13 CO+的分布与尘埃连续谱的分布相似，而N2 H+的分布更接近尘埃连续谱的分布。与H13 CO+和CS分布相比，OMC-2中的含氮分子N2 H+和NH3似乎更强烈。我们从N2 H+数据中确定了34个云核心。在猎户座星云区域，N2 H+的线宽很大（1.1-2.1 km/s）。在OMC-2/3区域，它变得中等（0.5-1.3 km/s），在猎户座星云南部较小（0.3-1.1 km/s）。另一方面，在N2 H+中观察到的静止核的气体动力学温度在$\int$形灯丝上是相当恒定的（~ 20 K）。我们在OMC-2/3区域没有检测到CCS排放。一般来说，N2 H+和HC 3 N在OMC-2/3区域的分布非常相似，但我们在OMC-3中观察到N2 H+和HC 3 N之间超过2'尺度的位移，OMC-3具有0-I类原恒星（候选者）链。
The ``integral-shaped filament'' of the Orion A giant molecular cloud was mapped in N2H+, and its northern end, the OMC-2/3 region was observed also in HC3N and CCS. The N2H+ distribution is similar to the dust continuum distribution, except for the central part of the Orion Nebula. The distribution of H13CO+ holds resemblance to that of dust continuum, but the N2H+ distribution looks more similar to dust continuum distribution. The N-bearing molecules, N2H+ and NH3 seem to be more intense in OMC-2, compared with the H13CO+ and CS distribution. We identified 34 cloud cores from N2H+ data. Over the Orion Nebula region, the N2H+ linewidth is large (1.1-2.1 km/s). In the OMC-2/3 region, it becomes moderate (0.5-1.3 km/s), and it is smaller (0.3-1.1 km/s) in the south of the Orion Nebula. On the other hand, the gas kinetic temperature of the quiescent cores observed in N2H+ is rather constant (~ 20 K) over the $\int$-shaped filament. We detected no CCS emission in the OMC-2/3 region. In general, N2H+ and HC3N distribution is quite similar in the OMC-2/3 region, but we observed displacement between N2H+ and HC3N over 2' scale in OMC-3, which has a chain of Class 0-I protostars (candidates).