http://arxiv.org/abs/2005.08161
We present the results of multiband observations of the blazar S5 0716+714 intra-night variability performed during 23 nights in the period from 04.2014 through 04.2015. The bluer-when-brighter trend is detected in both intra- and inter-night data. We assume that the jet component crossing the region where the medium becomes transparent to the optical radiation forms almost all optical emission of S5 0716+714. Deviations of some parts of the component from the general trajectory of the component can cause the Doppler factor of these parts to increase. Various maximum Doppler factors achieved by these parts of the component and different volumes occupied by them with the concave synchrotron self-absorption spectrum result in both the observed various color index behavior in variability and explain the absence of dependence of the bluer-when-brighter behavior on the object magnitude. We estimated spectral maximum frequencies from intra- and inter-night data. Both the agreement of the obtained values of $\nu_{\text{m}}\approx( 1.0-2.5)\cdot10^{14}$ GHz and the fact that $\nu_{\text{m}}$ is less than the frequencies of optical observations confirm our assumption about the nature of the blazar S5 0716+714 region radiating in the optical range.
M. Butuzova
Tue, 19 May 20
56/92
Comments: 31 pages, 16 figures, 3 tables
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