Cosmological evolution of quasar radio emission in the view of multifractality

Martins, Bruno Leonardo Canto; Belete, A. Bewketu; Femmam, Smain; Tornikosk, Merja; Lähteenmäki, Anne; Tammi, Joni; Leão, Izan de Castro; Medeiros, J. R. de

Cosmological evolution of quasar radio emission in the view of multifractality

Página do item simplificado Estatísticas

dc.contributor.author	Martins, Bruno Leonardo Canto
dc.contributor.author	Belete, A. Bewketu
dc.contributor.author	Femmam, Smain
dc.contributor.author	Tornikosk, Merja
dc.contributor.author	Lähteenmäki, Anne
dc.contributor.author	Tammi, Joni
dc.contributor.author	Leão, Izan de Castro
dc.contributor.author	Medeiros, J. R. de
dc.date.accessioned	2020-05-26T00:44:08Z
dc.date.available	2020-05-26T00:44:08Z
dc.date.issued	2019-03-11
dc.description.resumo	Variations in scaling behavior in the flux and emissions of distant astronomical sources with respect to their cosmic time are important phenomena that can provide valuable information about the dynamics within the sources and their cosmological evolution with time. Different studies have been applying linear analysis to understand and model quasars’ light curves. Here, we study the multifractal behavior of selected quasars’ radio emissions in their observed frame (at 22 and 37 GHz bands) and their rest frame. To this end, we apply the wavelet transform-based multifractal analysis formalism called wavelet transform modulus maxima. In addition, we verify whether the autoregressive integrated moving average (ARIMA) models fit our data. In our work, we observe strong multifractal behavior for all the sources. Additionally, we find that the degree of multifractality is strongly similar for each source and significantly different between sources at 22 and 37 GHz. This similarity implies that the two frequencies have the same radiation region and mechanism, whereas the difference indicates that the sources have intrinsically different dynamics. Furthermore, we show that the degree of multifractality is the same in the observed and rest frames of the quasars, i.e., multifractality is an intrinsic property of radio quasars. Finally, we show that the ARIMA models fit the 3C 345 quasar at 22 GHz and partially fit most of the time series, with the exception of the 3C 273 and 3C 279 quasars at 37 GHz, for which the models are found to be inadequate	pt_BR
dc.identifier.citation	MARTINS, Bruno Leonardo Canto et al. Cosmological Evolution of Quasar Radio Emission in the View of Multifractality. The Astrophysical Journal, [s. l.], v. 873, n. 2, p. 108-126, 11 mar. 2019. ISSN 1538-4357 versão online. DOI http://dx.doi.org/10.3847/1538-4357/ab074e. Disponível em: https://iopscience.iop.org/article/10.3847/1538-4357/ab074e. Acesso em: 25 maio 2020.	pt_BR
dc.identifier.doi	http://dx.doi.org/10.3847/1538-4357/ab074e
dc.identifier.issn	0004-637X (print), 1538-4357 (online)
dc.identifier.uri	https://repositorio.ufrn.br/jspui/handle/123456789/29059
dc.language	en	pt_BR
dc.publisher	American Astronomical Society	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	Galaxies: active	pt_BR
dc.subject	Methods: statistical	pt_BR
dc.subject	Quasars: individual (3C 273, 3C 279, 3C 345, 3C 454.3)	pt_BR
dc.title	Cosmological evolution of quasar radio emission in the view of multifractality	pt_BR
dc.type	article	pt_BR

Arquivos

Pacote Original

Agora exibindo 1 - 1 de 1

Nome:: Cosmological Evolution of Quasar Radio Emission in the View of Multifractality_2019.pdf
Tamanho:: 4.23 MB
Formato:: Adobe Portable Document Format