Comptonization in strongly magnetized and nonmagnetized plasmas

George Pavlov, Yu A. Shibanov, Peter Istvan Meszaros

Research output: Contribution to journalReview article

6 Citations (Scopus)

Abstract

We present a unified treatment of the continuum radiative transfer in optically thick hot plasmas where incoherent Compton scattering is important, either in the presence or absence of strong magnetic fields, as occurs in X-ray emitting neutron stars. Numerical solutions of the transfer equations are obtained and compared to a simplified analytical treatment, including the effect of stimulated scattering in an approximate manner. The latter effect is essential in order to obtain the correct spectrum at frequencies ω ≪ kT. In field-free plasmas the Comptonization drastically changes the outgoing spectrum if ( Ne 1022 cm-3) 1 2(kT/10 keV)- 9 4 ≪ 10, where Ne and T are the electron density and temperature of the plasma. In strongly magnetized plasmas (ωB≫kT, where ωB is the cyclotron frequency) the Comptonization effects are less significant than the magnetic effects at frequencies ω ≪ ωB, for parameters typical of accreting pulsars. The Comptonization is significant only for the ordinary polarization mode, which is much less intense than the extraordinary polarization mode. On the contrary, the Comptonization changes essentially all the properties of the radiation escaping at frequencies close to the cyclotron resonance, ω {reversed tilde equals} ωB. These results are useful in the optically thick regions of neutron star models of gamma ray bursters, and are of major relevance for an appropriate treatment of models of accreting pulsars and X-ray bursters.

Original languageEnglish (US)
Pages (from-to)187-210
Number of pages24
JournalPhysics Reports
Volume182
Issue number3
DOIs
StatePublished - Jan 1 1989

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pulsars
neutron stars
magnetic effects
cyclotron frequency
high temperature plasmas
polarization
cyclotron resonance
scattering
radiative transfer
x rays
gamma rays
electron energy
continuums
radiation
magnetic fields

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Pavlov, George ; Shibanov, Yu A. ; Meszaros, Peter Istvan. / Comptonization in strongly magnetized and nonmagnetized plasmas. In: Physics Reports. 1989 ; Vol. 182, No. 3. pp. 187-210.
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Comptonization in strongly magnetized and nonmagnetized plasmas. / Pavlov, George; Shibanov, Yu A.; Meszaros, Peter Istvan.

In: Physics Reports, Vol. 182, No. 3, 01.01.1989, p. 187-210.

Research output: Contribution to journalReview article

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N2 - We present a unified treatment of the continuum radiative transfer in optically thick hot plasmas where incoherent Compton scattering is important, either in the presence or absence of strong magnetic fields, as occurs in X-ray emitting neutron stars. Numerical solutions of the transfer equations are obtained and compared to a simplified analytical treatment, including the effect of stimulated scattering in an approximate manner. The latter effect is essential in order to obtain the correct spectrum at frequencies ω ≪ kT. In field-free plasmas the Comptonization drastically changes the outgoing spectrum if ( Ne 1022 cm-3) 1 2(kT/10 keV)- 9 4 ≪ 10, where Ne and T are the electron density and temperature of the plasma. In strongly magnetized plasmas (ωB≫kT, where ωB is the cyclotron frequency) the Comptonization effects are less significant than the magnetic effects at frequencies ω ≪ ωB, for parameters typical of accreting pulsars. The Comptonization is significant only for the ordinary polarization mode, which is much less intense than the extraordinary polarization mode. On the contrary, the Comptonization changes essentially all the properties of the radiation escaping at frequencies close to the cyclotron resonance, ω {reversed tilde equals} ωB. These results are useful in the optically thick regions of neutron star models of gamma ray bursters, and are of major relevance for an appropriate treatment of models of accreting pulsars and X-ray bursters.

AB - We present a unified treatment of the continuum radiative transfer in optically thick hot plasmas where incoherent Compton scattering is important, either in the presence or absence of strong magnetic fields, as occurs in X-ray emitting neutron stars. Numerical solutions of the transfer equations are obtained and compared to a simplified analytical treatment, including the effect of stimulated scattering in an approximate manner. The latter effect is essential in order to obtain the correct spectrum at frequencies ω ≪ kT. In field-free plasmas the Comptonization drastically changes the outgoing spectrum if ( Ne 1022 cm-3) 1 2(kT/10 keV)- 9 4 ≪ 10, where Ne and T are the electron density and temperature of the plasma. In strongly magnetized plasmas (ωB≫kT, where ωB is the cyclotron frequency) the Comptonization effects are less significant than the magnetic effects at frequencies ω ≪ ωB, for parameters typical of accreting pulsars. The Comptonization is significant only for the ordinary polarization mode, which is much less intense than the extraordinary polarization mode. On the contrary, the Comptonization changes essentially all the properties of the radiation escaping at frequencies close to the cyclotron resonance, ω {reversed tilde equals} ωB. These results are useful in the optically thick regions of neutron star models of gamma ray bursters, and are of major relevance for an appropriate treatment of models of accreting pulsars and X-ray bursters.

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