星际线谱快速非线性分析的计算机程序
A computer program for fast non-LTE analysis of interstellar line spectra
摘要：
大量和高质量的现代无线电和红外线观测需要有效的建模技术来推断物理和化学参数，如温度，密度和分子丰度。我们提出了一个计算机程序来计算在均匀介质中产生的原子和分子线的强度，基于涉及碰撞和辐射过程的统计平衡计算，包括来自背景源的辐射。用逃逸概率方法处理光学深度效应。该程序可在万维网http://www.sron.rug.nl/~vdtak/radex/index.shtml上获得。该计划利用莱顿原子和分子数据库（LAMDA）中保存的分子数据文件，该数据库将继续改进和扩展。该程序的性能进行比较，更近似，更复杂的方法。附录提供了诊断图，以根据通常观察到的分子的线强度比来估计物理参数。该计划将成为分析当前和未来射电和红外望远镜观测结果的重要工具。
英文摘要：
The large quantity and high quality of modern radio and infrared line observations require efficient modeling techniques to infer physical and chemical parameters such as temperature, density, and molecular abundances. We present a computer program to calculate the intensities of atomic and molecular lines produced in a uniform medium, based on statistical equilibrium calculations involving collisional and radiative processes and including radiation from background sources. Optical depth effects are treated with an escape probability method. The program is available on the World Wide Web at http://www.sron.rug.nl/~vdtak/radex/index.shtml . The program makes use of molecular data files maintained in the Leiden Atomic and Molecular Database (LAMDA), which will continue to be improved and expanded. The performance of the program is compared with more approximate and with more sophisticated methods. An Appendix provides diagnostic plots to estimate physical parameters from line intensity ratios of commonly observed molecules. This program should form an important tool in analyzing observations from current and future radio and infrared telescopes.
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