A model for the spectral evolution of the optical and radio outbursts in blazars

Details A model for the spectral evolution of the optical and radio outbursts in blazars A model for the spectral evolution of the optical and radio outbursts in blazars

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997acasn..38..239q&link_type=abstract

Acta Astronomica Sinica, vol. 38, p. 239

Astronomy and Astrophysics

Astronomy

3

Stellar Evolution, Blazars, Radio Stars, Astronomical Models, Radio Astronomy, High Energy Electrons, Shock Wave Propagation

Scientific paper

A theoretical model for the spectral evolution of the outbursts in optical and radio wavelength regions from blazars is discussed. It is considered that the relativistic electrons are injected (or accelerated) by a relativistic shock wave propagating down the jet, the axis of which makes a very small angle with the line of sight. The relativistic electrons experience Compton, synchro, and adiabatic losses, and the high-energy cut-off of the electron energy spectrum evolves due to the energy losses. The model shows that the outbursts evolve characteristically through three stages: the Compton stage, the synchrotron stage, and the adiabatic stage. This behavior of evolution can be described by the S(m)-v(m) relation, where S(m) is the turnover flux and v(m) is the turnover frequency. The theoretical relation is typical of the ones observed in blazars (for example, in 3C 273), and thus the proposed model can be used to interpret the spectral evolution of optical and radio outbursts of blazars. The outburst spectra for different epochs and the light curves for different frequencies are also given.

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