Photoionization and high-density gas

被引:533
作者
Kallman, T [1 ]
Bautista, M [1 ]
机构
[1] NASA, Goddard Space Flight Ctr, High Energy Astrophys Lab, Greenbelt, MD 20771 USA
关键词
atomic processes; radiation mechanisms : thermal; radiative transfer; ultraviolet : general; X-rays : general;
D O I
10.1086/319184
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present results of calculations using the XSTAR version 2 computer code. This code is loosely based on the XSTAR version 1 code, which has been available for public use for some time. However, it represents an improvement and update in several major respects, including atomic data, code structure, user interface, and improved physical description of ionization/excitation. In particular, it now is applicable to high-density situations in which significant excited atomic level populations are likely to occur. We describe the computational techniques and assumptions and present sample runs with particular emphasis on high-density situations.
引用
收藏
页码:221 / 253
页数:33
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