期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 458, 期 4, 页码 3554-3560出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stw527
关键词
atomic processes; galaxies: individual: M82; galaxies: starburst; X-rays: galaxies; X-rays: ISM
资金
- NASA [NNX09AC46G, NNX13AF31G]
- NSF East Asian and Pacific Summer Institute
- Chinese Academy of Sciences
- NASA [NNX09AC46G, 120597] Funding Source: Federal RePORTER
Recent X-ray observations of star-forming galaxies such as M82 have shown the Ly beta/Ly alpha line ratio of Ne x to be in excess of predictions for thermal electron impact excitation. Here, we demonstrate that the observed line ratio may be due to charge exchange and can be used to constrain the ion kinetic energy to be less than or similar to 500 eV/u. This is accomplished by computing spectra and line ratios via a range of theoretical methods and comparing these to experiments with He over astrophysically relevant collision energies. The charge exchange emission spectra calculations were performed for Ne10+ + H and Ne10+ + He using widely applied approaches including the atomic orbital close coupling, classical trajectory Monte Carlo, and multichannel Landau-Zener (MCLZ) methods. A comparison of the results from these methods indicates that for the considered energy range and neutrals (H, He) the so-called low-energy, l-distribution MCLZ method provides the most likely reliable predictions.
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