J 2021

Deterministic Aspect of the γ-Ray Variability in Blazars

BHATTA, G., Radim PÁNIS a Zdeněk STUCHLÍK

Základní údaje

Originální název

Deterministic Aspect of the γ-Ray Variability in Blazars

Autoři

BHATTA, G., Radim PÁNIS (703 Slovensko, domácí) a Zdeněk STUCHLÍK (203 Česká republika, domácí)

Vydání

Astrophysical Journal, GB - Spojené království Velké Británie a, 2021, 0004-637X

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Kód RIV

RIV/47813059:19630/21:A0000148

Organizační jednotka

Fyzikální ústav v Opavě

DOI

http://dx.doi.org/10.3847/1538-4357/abc625

Klíčová slova anglicky

active galactic nuclei;Fourier transform;γ-ray variability

Štítky

2022, , RIV22

Příznaky

Mezinárodní význam, Recenzováno
Změněno: 14. 2. 2022 12:43, Mgr. Pavlína Jalůvková

Anotace

V originále

Linear time series analysis, mainly the Fourier transform-based methods, has been quite successful in extracting information contained in the ever-modulating light curves of active galactic nuclei, and thereby contribute in characterizing the general features of supermassive black hole systems. In particular, the statistical properties of γ-ray variability of blazars are found to be fairly represented by flicker noise in the temporal frequency domain. However, these conventional methods have not been able to fully encapsulate the richness and the complexity displayed in the light curves of the sources. In this work, to complement our previous study on a similar topic, we perform nonlinear time series analysis of the decade-long Fermi/LAT observations of 20 γ-ray bright blazars. The study is motivated to address one of the most relevant queries: whether the dominant dynamical processes leading to the observed γ-ray variability are of deterministic or stochastic nature. For the purpose, we perform recurrence quantification analysis of the blazars and directly measure the quantities, which suggest that the dynamical processes in blazars could be a combination of deterministic and stochastic processes, while some of the source light curves revealed significant deterministic content. The result, with possible implication of strong disk-jet connection in blazars, could prove to be significantly useful in constructing models that can explain the rich and complex multiwavelength observational features in active galactic nuclei. In addition, we estimate the dynamical timescales, so-called trapping timescales, in the order of a few weeks. © 2020. The American Astronomical Society. All rights reserved.
Zobrazeno: 28. 12. 2024 21:37