Abstract:
We present the results of our study of spectral energy distributions (SEDs) of a sample of
10 low- to intermediate-synchrotron-peaked blazars. We investigate some of the physical
parameters most likely responsible for the observed short-term variations in blazars. To do
so, we focus on the study of changes in the SEDs of blazars corresponding to changes
in their respective optical fluxes. We model the observed spectra of blazars from radio to
optical frequencies using a synchrotron model that entails a log-parabolic distribution of
electron energies. A significant correlation among the two fitted spectral parameters (a, b) of
log-parabolic curves and a negative trend among the peak frequency and spectral curvature
parameter, b, emphasize that the SEDs of blazars are fitted well by log-parabolic curves. On
considering each model parameter that could be responsible for changes in the observed SEDs
of these blazars, we find that changes in the jet Doppler factors are most important.
