Work

Discovery of a ∼208 day Quasiperiodic Oscillation in the X-Ray Emission of the TeV Blazar 1ES 1959+650

Year: 2025

Type: article

Abstract: We report the discovery of a significant quasiperiodic oscillation (QPO) in the X-ray emission of the TeV blazar 1ES 1959+650 through a detailed timing analysis of long-term Swift X-ray Telescope data. The detected QPO has a period of ∼208 days with a high local confidence level (>5.0 σ ) and a global confidence level around 3.7 σ that persists for over 20 cycles across both high- and low-flux states. The overall variability is composed of this stable QPO superimposed on a slow, long-term trend. Furthermore, we demonstrate that a helical trajectory model for a propagating plasma blob in the jet compellingly reproduces the observed light curve, providing strong support for this physical interpretation.

Source: The Astrophysical Journal

DOI: 10.3847/1538-4357/ae2318

Authors: Bing-Kai Zhang, Min Jin, Peng Zong

Institutions: Fuyang Normal University, Southwest Jiaotong University

Language: English

Topic: Astrophysics and Cosmic Phenomena

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $4,499

Funder: National Natural Science Foundation of China