Investigating non-linear and stochastic hard X-ray variability of active galactic nuclei using recurrence analysis
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Le résumé fourni par la source
ABSTRACT We present results of recurrence analysis of 46 active galactic nuclei (AGNs) using light curves from the 157-month catalogue of the Swift Burst Alert Telescope (BAT) in the 14–150 keV band. We generate recurrence plots and compute recurrence plot metrics for each object. We use the surrogate data method to compare all derived recurrence-based quantities to three sets of stochastic light curves with identical power spectrum, flux distribution, or both, in order to determine the presence of determinism, non-linearity, entropy, and non-stationarity. We compare these quantities with known physical characteristics of each system, such as black hole mass, Eddington ratio, and bolometric luminosity, radio loudness, obscuration, and spectroscopic type. We find that almost all AGNs in this sample exhibit substantial higher order modes of variability than is contained in the power spectrum, with approximately half exhibiting non-linear or non-stationary behaviour. We find that Type 2 AGNs are more likely to contain deterministic variability than Type 1 AGNs, while the same distinction is not found between obscured and unobscured AGNs. The complexity of variability among Type 1 AGNs is anticorrelated with Eddington ratio, while no relationship is found among Type 2 AGNs. The connections between the recurrence properties and AGN class suggest that hard X-ray emission is a probe of distinct accretion processes among classes of AGNs, which supports interpretations of changing-look AGNs and challenges the traditional unification model that classifies AGNs only on viewing angle.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Investigating non-linear and stochastic hard X-ray variability of active galactic nuclei using recurrence analysis
- Date Crossref
- 23/11/2022
- Éditeur
- Oxford University Press (OUP)
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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University of Washington Department of Astronomy pays non établi dans la noticeUniversité ou école supérieure
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Villanova University Department of Physics pays non établi dans la noticeUniversité ou école supérieure
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Drexel University Department of Physics pays non établi dans la noticeUniversité ou école supérieure
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Goddard Space Flight Center pays non établi dans la noticeStructure de recherche
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Deleted Institution pays non établi dans la noticeStructure de recherche
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Astrophysics Science Division pays non établi dans la noticeInstitution
Department of Astronomy — University of Washington, Department of Physics — Villanova University et Department of Physics — Drexel University, avec 3 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.