期刊
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
卷 199, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0067-0049/199/1/20
关键词
atomic processes; ISM: general; plasmas
资金
- NASA [PF8-90053]
- Chandra X-ray Center
- Smithsonian Astrophysical Observatory for NASA [NAS8-03060]
- National Science Foundation [AST 0908877, AST 0607028]
- National Aeronautics and Space Administration [07-ATFP07-0124]
- HST [AR 12125.01]
- Direct For Mathematical & Physical Scien [1109061, 1108928] Funding Source: National Science Foundation
- Division Of Astronomical Sciences [1109061, 1108928] Funding Source: National Science Foundation
We present ion-by-ion cooling efficiencies for low-density gas. We use Cloudy (version 10.00) to estimate the cooling efficiencies for each ion of the first 30 elements (H-Zn) individually. We present results for gas temperatures between 10(4) and 10(8) K, assuming low densities and optically thin conditions. When nonequilibrium ionization plays a significant role the ionization states deviate from those that obtain in collisional ionization equilibrium (CIE), and the local cooling efficiency at any given temperature depends on specific nonequilibrium ion fractions. The results presented here allow for an efficient estimate of the total cooling efficiency for any ionic composition. We also list the elemental cooling efficiencies assuming CIE conditions. These can be used to construct CIE cooling efficiencies for non-solar abundance ratios or to estimate the cooling due to elements not included in any nonequilibrium computation. All the computational results are listed in convenient online tables.
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