Time-dependent X-ray spectra of Compton-cooled plasmas

Statistics – Computation

Scientific paper

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Compton Effect, Energy Dissipation, Plasma Cooling, Time Dependence, X Ray Sources, X Ray Spectra, Gas Temperature, Particle Energy, Photons, Temperature Distribution

Scientific paper

Emergent spectra produced when gas cools in response to energy loss through Comptonization are calculated using two independent and complementary methods. It is shown that Wien peaks never occur in the time-averaged spectrum, and flat power-laws arise from a wide range of parameters. Many of the compact X-ray sources under consideration show evidence of rapid time variability, which suggests that the heating and cooling of the hot gas in these sources is far from a steady state. A range of optical depths and initial temperatures are used in the computations, and the gas temperature is allowed to drop in response to Compton cooling. Analytical methods are discussed for the case where Compton cooling time exceeds photon diffusion time across the gas, and it is shown that quasi-power law spectra always result from Comptonization whenever a significant fraction of the thermal energy of the gas is transferred to the radiation field.

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