English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Study of the polarization behaviour in blazars is a powerful tool to discernthe role of magnetic field in the variable emission process in theirrelativistic jets. We present here results of our systematic investigation onthe correlation between optical flux and polarization variations for eightflat-spectrum radio quasars on various timescales using data from the StewardObservatory that covers a period of $\sim$10 years. On long time scales($\sim$several months), from a total of 79 observing cycles, in 34 observingcycles, we found a significant positive correlation between optical flux andoptical polarization degree (PD), negative correlation in 3 cycles and nocorrelation in 42 cycles. On short time scales ($\sim$few days), in 47 out of atotal of 55 epochs, we found a positive correlation between optical flux andPD, while, on the remaining 8 epochs, an anti-correlation was detected betweenthe two quantities. Moreover, we noticed a significant positive correlationbetween optical and $\gamma-$ray fluxes on 14 epochs and a negative correlationbetween the two on one epoch. While the observed optical flux changes well fitin the shock-in-jet model, the observed changes in PD are not explainable bychanges in the power-law spectral index of the relativistic electrons in thejet. Instead, the observed varied correlations between optical flux and PDcould be due to multi-zone emission regions or the enhanced flux coincidingwith the emergence of a new emission knot with its magnetic field eitheraligned or misaligned with the large scale magnetic field.

Correlation between optical flux and polarization variations in Flat Spectrum Radio Quasars on diverse timescales