Analytic fitting formulae for relativistic electron-electron thermal bremsstrahlungS. Nozawa1, K. Takahashi2, Y. Kohyama2, and N. Itoh2
1 Josai Junior College, 1-1 Keyakidai, Sakado-shi, Saitama, 350-0295, Japan
2 Department of Physics, Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo, 102-8554, Japan
Received 1 November 2008 / Accepted 18 February 2009
We present accurate analytic fitting formulae for electron-electron thermal bremsstrahlung emissivity. The fitting formulae have an overall accuracy of higher than 0.5% for a wide electron temperature range 1 keV 7 MeV, which will be useful when analyzing the precision observational data from the non-relativistic regime to mildly-relativistic regime. Assuming the thermal plasma, the present formulae will be also applicable to the relativistic regime.
Key words: cosmology: theory -- galaxies: clusters: general -- radiation mechanisms: thermal -- relativity -- X-rays: galaxies: clusters
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