Detailed Information on Publication Record
2020
Deterministic Aspect of the gamma-Ray Variability in Blazars
BHATTA, Gopal, Radim PÁNIS and Zdeněk STUCHLÍKBasic information
Original name
Deterministic Aspect of the gamma-Ray Variability in Blazars
Authors
BHATTA, Gopal, Radim PÁNIS (703 Slovakia, belonging to the institution) and Zdeněk STUCHLÍK (203 Czech Republic, belonging to the institution)
Edition
Astrophysical Journal, 2020, 0004-637X
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10308 Astronomy
Country of publisher
United Kingdom of Great Britain and Northern Ireland
Confidentiality degree
není předmětem státního či obchodního tajemství
References:
RIV identification code
RIV/47813059:19630/20:A0000055
Organization unit
Institute of physics in Opava
UT WoS
000601622200001
Keywords in English
Time series analysis; Time domain astronomy; Blazars; Relativistic jets; Gamma-ray transient sources; High energy astrophysics; Active galactic nuclei; Supermassive black holes
Tags
International impact, Reviewed
Links
EF19_073/0016951, research and development project.
Změněno: 23/3/2021 18:31, RNDr. Jan Hladík, Ph.D.
Abstract
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 gamma-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 gamma-ray bright blazars. The study is motivated to address one of the most relevant queries: whether the dominant dynamical processes leading to the observed gamma-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.