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

The TeV blazar Ton 599 has exhibited a peculiar flare in 2017 November. Thetemporal variation of the source is studied using simultaneous $\gamma$-raydata from $\textit{Fermi}$ Large Area Telescope and radio data from OwensValley Radio Observatory's 40 m telescope, over the period of nine years. Fourmajor flaring periods are observed in the $\gamma$-ray energy band of 0.1-300GeV. These periods are studied on a shorter timescale and modeled with atime-dependent function containing exponential rising and decaying components.The physical parameters of the jet are estimated numerically and compared withthose reported in the literature. During the fourth flare a bunch of highenergy photons ($>$10 GeV) were detected. The two highest energy photons havingan energy of 76.9 GeV and 61.9 GeV are detected on MJD 58059.0 and 58073.3,respectively. This observation possibly constrains the $\gamma$-ray emissionregion to lie near outer edge or outside the broad line region of size$\sim$0.08 pc. The variation of equivalent width of a Mg-II line is studiedusing the spectroscopic data from Steward observatory. It was observed that theequivalent width of the line varies inversely with the underlying power-lawcontinuum.

Temporal variability and estimation of jet parameters for Ton 599