Compton scattering in sources with synchrotron reabsorption

V. M. Charugin, Z. I. Tsvetanov

Research output: Contribution to journalArticle


By considering the consecutive effects of synchrotron reabsorption, Compton scattering and other kinds of energy losses of relativistic electrons, it may be possibile to form a universal distribution of electrons in the region of reabsorption ('synchrotron reactor'). This will be either a power law with a power index of the energy spectrum nr=3-5β, or a relativistic Maxwell distribution with an electron temperature Te=4 Tb(1+β), where β is the ratio of Compton (or other losses) to synchrotron losses, and Tbis the brightness temperature of the radiation. Since the total energy losses of electrons in the reactor is equal to zero, this ensures the continuous existence and accumulation of relativistic electrons in the region of reabsorption and their associated hard scattered radiation. Multiple Compton scattering produces a specific 'stepped' power distribution of scattered radiation by which we can identify the reactor. In the nuclei of quasars ρ{variant}≪WHand, therefore, nr=3; hence the spectral index of scattered radiation in the corresponding ranges (optical, UV, X- and γ-ray) is ατ.Consideration of other kinds of losses and gains of energy by electrons can lead to the dependence nτ=3-5β(E) - where β(E) may have either positive or negative values-which, in turn, leads to the frequency dependence of the spectral index of scattered radiation ατ= 1 - δ(ν), |δ(ν)| < 1, |β(E)| < 1. Within the framework of the model being considered, the physical parameters of the nucleus of quasar 3C 273 are calculated.

Original languageEnglish
Pages (from-to)309-320
Number of pages12
JournalAstrophysics and Space Science
Issue number2
Publication statusPublished - 1 Feb 1980


ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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