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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We present a variability study of the blazar PKS 0346-27 from December 2018to January 2022 in its archival $\gamma$-ray observation by Fermi-LAT. We usethe Lomb-Scargle periodogram and the weighted wavelet transform methods inorder to detect the presence of periodicity/quasi-periodicity and localize thisfeature in time and frequency space. The significance of the periodicityfeature has been estimated using the Monte-Carlo simulation approach. We havealso determined the global significance of the periodicity to test therobustness of our claim. To explore the most probable scenario, we modeled thelight curve with both a straight jet and a curved jet model. We detect aperiodicity feature of $\sim$ 100 days duration for the entire period ofobservation with a statistical significance of $3\sigma$, which amounts to a99.7\% confidence level. The global significance of this feature is found to be96.96\%. Based on the Akaike Information Criteria, the most probableexplanation is that the observed emission is enhanced due to the helical motionof a blob within a curved jet. The origin of this QPO is very likely a regionof enhanced emission moving helically inside a curved jet. This work presentsstrong evidence for jet curvature in the source and an independent (albeit alittle serendipitous) procedure to estimate the curvature in blazar jets.

Quasi-periodic oscillation detected in $\gamma$-rays in blazar PKS 0346-27