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T: Fachverband Teilchenphysik
T 10: Gamma astronomy 1
T 10.3: Vortrag
Montag, 4. März 2024, 16:30–16:45, Geb. 30.22: kl. HS A
High-energy variability of the gravitationally lensed blazar PKS 1830-211 — •Sarah M. Wagner1,2, Jeffrey D. Scargle3, Greg Madejski2, Andrea Gokus4, and Krzysztof Nalewajko5 — 1Uni Würzburg, Germany — 2Stanford University, USA — 3NASA Ames, USA (retired) — 4Washington University in St. Louis, USA — 5Polish Academy of Sciences, Poland
Gravitational lenses can be used as microscopes to investigate the origin of the highly variable high-energy emission observed from blazar jets. We study the broad-band spectral properties and the multi-wavelength variability of the gravitationally-lensed blazar PKS 1830-211 to put constraints on the structure and relevant physics of its jet. We utilize Swift/XRT, NuSTAR, and Fermi-LAT observations from 2016 and 2019 to compare periods of low activity and high activity. Additionally, we introduce a novel method to observe short-timescale variability in unbinned NuSTAR data and present an extensive discussion on the gravitationally-induced time delay in the gamma-ray light curve observed with Fermi-LAT. Based on our analysis, we find a delay of ~22 days and illustrate that delicate methods are needed to reliably detect this. The detection of a consistent lag throughout the whole light curve suggests that the production site of the gamma-ray emission is spatially constant. When comparing the 2016 and 2019 datasets, the X-ray part of the SED is remarkably stable in comparison to the dramatic change in the gamma rays. We explain the differences in the activity observed in X-rays and gamma rays as arising due to a change in the break in the electron energy distribution.
Keywords: blazars; AGN; gravitational lensing; time series analysis