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首页> 外文期刊>The Astrophysical Journal. Supplement Series >Spatial Variation of the Chemical Properties of Massive Star-forming Clumps
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Spatial Variation of the Chemical Properties of Massive Star-forming Clumps

机译：巨型恒星形成丛的化学性质的空间变化

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摘要

We selected 90 massive star-forming clumps with strong N2H+(1-0), HCO+(1-0), HCN(1-0), and HNC(1-0) emission from the Millimetre Astronomy Legacy Team 90 GHz survey. We obtained Herschel data for all 90 sources and NRAO VLA Sky Survey data for 51 of them. We convolved and regridded all images to the same resolution and pixel size and derived the temperature, H-2 column density, molecules' abundances and abundance, and ratios of each pixel. Our analysis yields three main conclusions. First, the abundances of N2H+, HCO+, HCN, and HNC increase when the column density decreases and the temperature increases, with spatial variations in their abundances dominated by changes in the H-2 column density. Second, the abundance ratios between N2H+, HCO+, HCN, and HNC also display systemic variations as a function of the column density due to the chemical properties of these molecules. Third, the sources associated with the 20 cm continuum emission can be classified into four types based on the behavior of the abundances of the four molecules considered here as a function of this emission. The variations of the first three types could also be attributed to the variation of the H-2 column density.
机译：我们选择了90个巨大的恒星形成丛，具有强大的N2H +（1-0），HCO +（1-0），HCN（1-0）和HNC（1-0）和HNC（1-0）排放来自毫米的天文遗留队90 GHz调查。我们为所有90个来源和Nrao VLA天空调查数据获得了Herschel数据，有51个。我们将所有图像卷积并被遗传到相同的分辨率和像素大小，并导出温度，H-2列密度，分子的丰度和丰度，以及每个像素的比率。我们的分析会产生三个主要结论。首先，当柱密度降低并且温度升高时，N2H +，HCO +，HCN和HNC的丰度增加，其丰满的空间变化由H-2列密度的变化主导。其次，N 2 H +，HCO +，HCN和HNC之间的丰度比也由于这些分子的化学性质而显示出作为柱密度的函数的系统变化。第三，基于此处考虑的四个分子的丰度作为这种发射的功能，可以将与20cm连续发射相关的源分为四种类型。前三种类型的变型也可以归因于H-2列密度的变化。

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