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000002111 005__ 20160701171658.0
000002111 0247_ $$2DOI$$a10.1093/mnras/stv404
000002111 037__ $$aASTROimport-268
000002111 100__ $$avan Hoof, P. A. M.
000002111 245__ $$aAccurate determination of the free-free Gaunt factor - II. Relativistic Gaunt factors
000002111 260__ $$c2015
000002111 520__ $$aWhen modelling an ionized plasma, all spectral synthesis codes need the thermally averaged free-free Gaunt factor defined over a very wide range of parameter space in order to produce an accurate prediction for the spectrum. Until now no data set exists that would meet these needs completely. We have therefore produced a table of relativistic Gaunt factors over a much wider range of parameter space than has ever been produced before. We present tables of the thermally averaged Gaunt factor covering the range 10log γ2 = -6 to 10 and 10log u = -16 to 13 for all atomic numbers Z = 1 through 36. The data were calculated using the relativistic Bethe-Heitler-Elwert (BHE) approximation and were subsequently merged with accurate non-relativistic results in those parts of the parameter space where the BHE approximation is not valid. These data will be incorporated in the next major release of the spectral synthesis code CLOUDY. We also produced tables of the frequency integrated Gaunt factor covering the parameter space 10log γ2 = -6 to +10 for all values of Z between 1 and 36. All the data presented in this paper are available online.
000002111 700__ $$a Ferland, G. J.
000002111 700__ $$a Williams, R. J. R.
000002111 700__ $$a Volk, K.
000002111 700__ $$a Chatzikos, M.
000002111 700__ $$a Lykins, M.
000002111 700__ $$a Porter, R. L.
000002111 773__ $$c2112-2118$$i2$$pMonthly Notices of the Royal Astronomical Society$$v449$$y2015
000002111 85642 $$ahttp://esoads.eso.org/abs/2015MNRAS.449.2112V
000002111 905__ $$apublished in
000002111 980__ $$aREFERD