Abstract
The TeV-X ray flare observed in May of 1994 in the BL Lac object Mrk 421 is interpreted in terms of synchrotron-self Compton (SSC) mechanism. It is suggested that the TeV-X ray flare is produced by a high-energy component of flat electron-energy distribution with a spectral index of α e ≈ 0.25 at low energies. This flaring component is independent of the low-energy component (or quiescent component), which has a steeper electron-energy distribution and produces the radiation spectrum in the quiescent regime. In addition to the fact that most radio outbursts show flat electron-energy distributions with spectral index α e ≈ 0.2–0.4, the above result implies that the basic mechanism of particle acceleration in AGNs produces flat energy distributions.
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