The multifrequency variability of Mrk 421

摘要: We present a model of the multifrequency variability blazar Mrk 421. The explains correlated observed from Very High Energy (VHE) gamma rays to radio frequencies. assume that dominant part stationary emission frequencies X-rays is generated by synchrotron radiation relativistic electrons ejected central engine. particles move center source with velocities and form an inhomogeneous jet. perform detailed calculations transfer calculate evolution electron energy spectrum along explain evolving Inverse-Compton (IC) compact component (a blob) which travels Two scenarios have been considered as mechanisms generate VHE flares. first scenario assumes high electrons, necessary for generation flares, are injected into jet, directly engine or acceleration zone (e.g., shock wave). second scheme in situ acceleration, example diffusive waves localized turbulence inside evolve They cooled radiative processes adiabatic expansion compete process injection electrons. new observations we obtained domain data gathered February-April 2001 show well defined outburst corresponds X-ray RXTE-ASM gamma-ray flare detected HEGRA TeV range. best our knowledge, this direct observational evidence simultaneously range at very energies. Our middle jet describes temporal such multispectral flare.