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Title: Non-relativistic Free–Free Emission due to the n -distribution of Electrons—Radiative Cooling and Thermally Averaged and Total Gaunt Factors

Abstract

Tracking the thermal evolution of plasmas, characterized by an n -distribution, using numerical simulations, requires the determination of the emission spectra and of the radiative losses due to free–free emission from the corresponding temperature-averaged and total Gaunt factors. Detailed calculations of the latter are presented and associated with n -distributed electrons with the parameter n ranging from 1 (corresponding to the Maxwell–Boltzmann distribution) to 100. The temperature-averaged and total Gaunt factors with decreasing n tend toward those obtained with the Maxwell–Boltzmann distribution. Radiative losses due to free–free 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 thermal-averaged and total Gaunt factors calculated for n -distributions, and a wide range of electron and photon energies, are presented.

Authors:
 [1];  [2]
  1. Department of Mathematics, University of Évora, R. Romão Ramalho 59, 7000 Évora (Portugal)
  2. Zentrum für Astronomie und Astrophysik, Technische Universität Berlin, Hardenbergstrasse 36, D-10623 Berlin (Germany)
Publication Date:
OSTI Identifier:
22661093
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal, Supplement Series; Journal Volume: 232; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BOLTZMANN STATISTICS; COMPUTERIZED SIMULATION; ELECTRONS; EMISSION SPECTRA; EQUILIBRIUM; EVOLUTION; HELIUM IONS; IONIZATION; IRON IONS; MAGNESIUM IONS; NEON IONS; PHOTONS; PLASMA; RADIATIVE COOLING; RELATIVISTIC RANGE; SILICON IONS

Citation Formats

De Avillez, Miguel A., and Breitschwerdt, Dieter, E-mail: mavillez@galaxy.lca.uevora.pt. Non-relativistic Free–Free Emission due to the n -distribution of Electrons—Radiative Cooling and Thermally Averaged and Total Gaunt Factors. United States: N. p., 2017. Web. doi:10.3847/1538-4365/AA850A.
De Avillez, Miguel A., & Breitschwerdt, Dieter, E-mail: mavillez@galaxy.lca.uevora.pt. Non-relativistic Free–Free Emission due to the n -distribution of Electrons—Radiative Cooling and Thermally Averaged and Total Gaunt Factors. United States. doi:10.3847/1538-4365/AA850A.
De Avillez, Miguel A., and Breitschwerdt, Dieter, E-mail: mavillez@galaxy.lca.uevora.pt. Fri . "Non-relativistic Free–Free Emission due to the n -distribution of Electrons—Radiative Cooling and Thermally Averaged and Total Gaunt Factors". United States. doi:10.3847/1538-4365/AA850A.
@article{osti_22661093,
title = {Non-relativistic Free–Free Emission due to the n -distribution of Electrons—Radiative Cooling and Thermally Averaged and Total Gaunt Factors},
author = {De Avillez, Miguel A. and Breitschwerdt, Dieter, E-mail: mavillez@galaxy.lca.uevora.pt},
abstractNote = {Tracking the thermal evolution of plasmas, characterized by an n -distribution, using numerical simulations, requires the determination of the emission spectra and of the radiative losses due to free–free emission from the corresponding temperature-averaged and total Gaunt factors. Detailed calculations of the latter are presented and associated with n -distributed electrons with the parameter n ranging from 1 (corresponding to the Maxwell–Boltzmann distribution) to 100. The temperature-averaged and total Gaunt factors with decreasing n tend toward those obtained with the Maxwell–Boltzmann distribution. Radiative losses due to free–free 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 thermal-averaged and total Gaunt factors calculated for n -distributions, and a wide range of electron and photon energies, are presented.},
doi = {10.3847/1538-4365/AA850A},
journal = {Astrophysical Journal, Supplement Series},
number = 1,
volume = 232,
place = {United States},
year = {Fri Sep 01 00:00:00 EDT 2017},
month = {Fri Sep 01 00:00:00 EDT 2017}
}