Synchrotron Self Compton Model

The Synchrotron Self-Compton Model (English: Synchrotron Self-Compton Model ), SSC model for short , describes a multiple scattering process in particle and astrophysics .

The SSC model assumes that charge carriers - usually electrons - first generate synchrotron radiation , i.e. photons , in order to then enter into a scattering process with them. The second scattering process will be an inverse Compton scattering process , that is, the photons will gain energy in this scattering process.

Because of the energy ranges in which the radiation and scattering processes take place, the SSC model is primarily used to interpret the data from sources that have a so-called " BL Lacertae " spectrum. It is a spectrum with two energy maxima in the energy-resolved intensity. The first maximum is typically in the energy range of X-rays (synchrotron radiation spectrum), the second maximum in an even higher energy range (gamma radiation).

In the high-energy range, too, one often finds a spectrum that is plotted double-logarithmically and has a kink, which means the transition from a power law dependence with a negative exponent , i.e. the shape , to a greater drop. This is interpreted as a Klein-Nishina transition , i.e. as a transition from an effective cross-section of the scattering of the charge carriers (e.g. electrons) with their synchrotron photons from the low-energy range in which the Thomson cross-section applies to an area in which the high energy terms of the more general small Nishina cross section come into play. ${\ displaystyle A \ cdot x ^ {- r}}$

The SSC model is often used to model the emissions from active galaxies .

Individual evidence

↑ R. Schlickeiser, J. Ruppel: Klein-Nishina steps in the energy spectrum of galactic cosmic ray electrons Institute for Theoretical Physics, Chair IV: Space and Astrophysics, Ruhr-Universitat Bochum, Bochum, 2009
^ Matthew L. Lister, Alan P. Marscher: Predictions of ECS and SSC models for flux-limited samples of γ-ray blazars . In: Astroparticle Physics . tape 11 , no. 1-2 , June 1999, pp. 65 , doi : 10.1016 / S0927-6505 (99) 00027-4 .

[1] R. Schlickeiser, J. Ruppel: Klein-Nishina steps in the energy spectrum of galactic cosmic ray electrons Institute for Theoretical Physics, Chair IV: Space and Astrophysics, Ruhr-Universitat Bochum, Bochum, 2009

[DOI10.1016/S0927-6505(99)00027-4-2] Matthew L. Lister, Alan P. Marscher: Predictions of ECS and SSC models for flux-limited samples of γ-ray blazars . In: Astroparticle Physics . tape 11 , no. 1-2 , June 1999, pp. 65 , doi : 10.1016 / S0927-6505 (99) 00027-4 .