Searching for signatures of chaos in γ-ray light curves of selected Fermi-LAT blazars

DOI: 
10.1093/mnras/stab146
Publication date: 
24/04/2021
Main author: 
Ostapenko, O.
IAA authors: 
Pascual-Granado, J.
Authors: 
Ostapenko, O.;Tarnopolski, M.;Żywucka, N.;Pascual-Granado, J.
Journal: 
Monthly Notices of the Royal Astronomical Society
Publication type: 
Article
Volume: 
502
Pages: 
2750
Abstract: 
Blazar variability appears to be stochastic in nature. However, a possibility of low-dimensional chaos was considered in the past, but with no unambiguous detection so far. If present, it would constrain the emission mechanism by suggesting an underlying dynamical system. We rigorously searched for signatures of chaos in Fermi-Large Area Telescope light curves of 11 blazars. The data were comprehensively investigated using the methods of nonlinear time-series analysis: phase-space reconstruction, fractal dimension, and maximal Lyapunov exponent (mLE). We tested several possible parameters affecting the outcomes, in particular the mLE, in order to verify the spuriousness of the outcomes. We found no signs of chaos in any of the analysed blazars. Blazar variability is either truly stochastic in nature or governed by high-dimensional chaos that can often resemble randomness.
Database: 
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2021MNRAS.502.2750O/abstract
ADS Bibcode: 
2021MNRAS.502.2750O
Keywords: 
chaos;methods: data analysis;galaxies: active;BL Lacertae objects: general;galaxies: jets;gamma-rays: galaxies;Astrophysics - High Energy Astrophysical Phenomena