Multifractality signatures in quasars time series – I. 3C 273

Martins, Bruno Leonardo Canto; Belete, A. Bewketu; Bravo, J. P.; Leão, I. C.; Araujo, J. M. de; Medeiros, J.R. de

Multifractality signatures in quasars time series – I. 3C 273

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dc.contributor.author	Martins, Bruno Leonardo Canto
dc.contributor.author	Belete, A. Bewketu
dc.contributor.author	Bravo, J. P.
dc.contributor.author	Leão, I. C.
dc.contributor.author	Araujo, J. M. de
dc.contributor.author	Medeiros, J.R. de
dc.date.accessioned	2020-07-02T21:15:23Z
dc.date.available	2020-07-02T21:15:23Z
dc.date.issued	2018-05-18
dc.description.resumo	The presence of multifractality in a time series shows different correlations for different timescales as well as intermittent behaviour that cannot be captured by a single scaling exponent. The identification of a multifractal nature allows for a characterization of the dynamics and of the intermittency of the fluctuations in non-linear and complex systems. In this study, we search for a possible multifractal structure (multifractality signature) of the flux variability in the quasar 3C 273 time series for all electromagnetic wavebands at different observation points, and the origins for the observed multifractality. This study is intended to highlight how the scaling behaves across the different bands of the selected candidate, which can be used as an additional new technique to group quasars based on the fractal signature observed in their time series and determine whether quasars are non-linear physical systems or not. The multifractal detrended moving average algorithm (MFDMA) has been used to study the scaling in non-linear, complex, and dynamic systems. To achieve this goal, we applied the backward (θ = 0) MFDMA method for one-dimensional signals. We observe weak multifractal (close to monofractal) behaviour in some of the time series of our candidate except in the mm, UV and X-ray bands. The non-linear temporal correlation is the main source of the observed multifractality in the time series whereas the heaviness of the distribution contributes less.	pt_BR
dc.identifier.citation	BELETE, A Bewketu; BRAVO, J. P.; MARTINS, Bruno Leonardo Canto; LEÃO, I. C.; ARAUJO, J. M. de; MEDEIROS, J. R. de. Multifractality signatures in quasars time series – I. 3C 273. Monthly Notices Of The Royal Astronomical Society, [s.l.], v. 478, n. 3, p. 3976-3986, 18 maio 2018. ISSN 1365-2966 versão online. Disponível em: https://academic.oup.com/mnras/article-abstract/478/3/3976/4999923?redirectedFrom=fulltext. Acesso em: 02 jul. 2020. http://dx.doi.org/10.1093/mnras/sty1316.	pt_BR
dc.identifier.doi	http://dx.doi.org/10.1093/mnras/sty1316
dc.identifier.issn	0035-8711 (print), 1365-2966 (online)
dc.identifier.uri	https://repositorio.ufrn.br/jspui/handle/123456789/29407
dc.language	en	pt_BR
dc.publisher	Oxford University Press (OUP)	pt_BR
dc.subject	Methods: statistical	pt_BR
dc.subject	Galaxies: active	pt_BR
dc.subject	Quasars: individual: 3C 273.	pt_BR
dc.title	Multifractality signatures in quasars time series – I. 3C 273	pt_BR
dc.type	article	pt_BR