Nonrelativistic FreeFree Emission due to the ndistribution of Electrons—Radiative Cooling and Thermally Averaged and Total Gaunt Factors
Abstract
Tracking the thermal evolution of plasmas, characterized by an ndistribution, using numerical simulations, requires the determination of the emission spectra and of the radiative losses due to freefree emission from the corresponding temperatureaveraged and total Gaunt factors. Detailed calculations of the latter are presented and associated with ndistributed electrons with the parameter n ranging from 1 (corresponding to the MaxwellBoltzmann distribution) to 100. The temperatureaveraged and total Gaunt factors with decreasing n tend toward those obtained with the MaxwellBoltzmann distribution. Radiative losses due to freefree emission in a plasma evolving under collisional ionization equilibrium conditions and composed by H, He, C, N, O, Ne, Mg, Si, S, and Fe ions, are presented. These losses decrease with a decrease in the parameter n, reaching a minimum when n = 1, and thus converge with the loss of thermal plasma. Tables of the thermalaveraged and total Gaunt factors calculated for ndistributions, and a wide range of electron and photon energies, are presented.
 Publication:

The Astrophysical Journal Supplement Series
 Pub Date:
 September 2017
 DOI:
 10.3847/15384365/aa850a
 arXiv:
 arXiv:1707.05291
 Bibcode:
 2017ApJS..232...12D
 Keywords:

 atomic data;
 atomic processes;
 ISM: general;
 plasmas;
 radio continuum: general;
 radiation mechanisms: general;
 Astrophysics  High Energy Astrophysical Phenomena
 EPrint:
 Accepted for publication in ApJS. 70 pages, 7 figures and 11 tables