Ne X X-ray Emission due to Charge Exchange in M82

Abstract

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 <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 Ne[10+] +H and Ne[10+] +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.

arXiv comment8 pages, 9 figures

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• Resolving the Origin of the Diffuse Soft X-ray Background
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• Revisiting the abundance pattern and charge-exchange emission in the M82 centre
• Spatially resolved X-ray spectra of the Galactic SNR G18.95-1.1: SRG/eROSITA view
• Astro2020: Hot Drivers of Stellar Feedback from 10 to 10,000 pc