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Radiation-Transfer Modeling of the Cloud L1544 in the HCO+ and HC18O+ Emission Lines

机译:HCO +和HC18O +发射线中云L1544的辐射传递模型

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摘要

We study the formation of HCO+ and HC18O+ emission lines in the cloud L1544. The radiation transfer is modeled numerically, and the line intensities for different impact parameters are calculated. It is shown that a decrease in the abundances of the studied molecules toward the object center is necessary for the formation of the observed line profile in the optically thin case. We consider various hydrodynamic models allowing for compression, turbulence, and different types of cloud rotation and find a model ensuring the best agreement with the observational data. Our numerical simulations are indicative of nonuniform rotation in L1544. Assuming that the object is spherically symmetric, we estimate the density and velocity of the medium within the framework of the selected model.
机译:我们研究了云L1544中HCO +和HC18O +发射线的形成。对辐射传输进行数值建模,并计算不同冲击参数的线强度。结果表明,在光学上较薄的情况下,要形成观察到的线轮廓,必须朝着物体中心减小被研究分子的丰度。我们考虑允许压缩,湍流和不同类型的云层旋转的各种流体动力学模型,并找到一个可确保与观测数据最佳吻合的模型。我们的数值模拟表明L1544中旋转不均匀。假设对象是球对称的,我们估计所选模型框架内介质的密度和速度。

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