Revealing the non-linear behaviour of the lensed quasar Q0957+561

Knowledge about how the non-linear behaviour of the intrinsic signal from lensed background sources changes on its path to the observer provides much information, particularly about the matter distribution in lensing galaxies and the physical properties of the current universe, in general. Here,...

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Principais autores: Martins, Bruno Leonardo Canto, Belete, A. Bewketu, Leão, I. C., Medeiros, J. R. de
Formato: article
Idioma:English
Publicado em: Oxford University Press (OUP)
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Methods: statistical
Quasar: individual: Q0957+561.
Endereço do item:https://repositorio.ufrn.br/jspui/handle/123456789/29454
http://dx.doi.org/10.1093/mnras/stz203
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spelling ri-123456789-294542020-07-12T07:47:59Z Revealing the non-linear behaviour of the lensed quasar Q0957+561 Martins, Bruno Leonardo Canto Belete, A. Bewketu Leão, I. C. Medeiros, J. R. de Methods: statistical Quasar: individual: Q0957+561. Knowledge about how the non-linear behaviour of the intrinsic signal from lensed background sources changes on its path to the observer provides much information, particularly about the matter distribution in lensing galaxies and the physical properties of the current universe, in general. Here, we analyse the multifractal behaviour of the optical observations of A and B images of Q0957+561 in the r and g bands. Aims: To verify the presence, or absence, of extrinsic variations in the observed signals of the quasar images and whether extrinsic variations affect the multifractal behaviour of their intrinsic signals. Method: We apply a wavelet transform modulus maxima-based multifractality analysis approach. Results: We detect strong multifractal signatures in the light curves of the quasar images. The degree of multifractality for both images in the r band changes over time in a non-monotonic way, indicating the presence of extrinsic variabilities in the light curves of the images. Additionally, in the r band, in periods of quiescent microlensing activity, we find that the degree of multifractality of image A is stronger than that of B, while B has a larger multifractal strength in recent epochs when it appears to be affected by microlensing. Finally, comparing the optical bands in a period of quiescent microlensing activity, we find that the degree of multifractality is stronger in the r band for both quasar images. In the absence of microlensing, the observed excesses of non-linearity are most likely generated when the broad-line region reprocesses the radiation from the compact sources. 2020-07-06T18:17:01Z 2020-07-06T18:17:01Z 2019-01-18 article BELETE, A Bewketu; MARTINS, Bruno Leonardo Canto; LEÃO, I. C.; MEDEIROS, J. R. Revealing the non-linear behaviour of the lensed quasar Q0957+561. Monthly Notices Of The Royal Astronomical Society, [s.l.], v. 484, n. 3, p. 3552-3560, 18 jan. 2019. ISSN 1365-2966 versão online. Disponível em: https://academic.oup.com/mnras/article-abstract/484/3/3552/5292506?redirectedFrom=fulltext. Acesso em: 06 jul. 2020. http://dx.doi.org/10.1093/mnras/stz203. 0035-8711 (print), 1365-2966 (online) https://repositorio.ufrn.br/jspui/handle/123456789/29454 http://dx.doi.org/10.1093/mnras/stz203 en application/pdf Oxford University Press (OUP)
institution Repositório Institucional
collection RI - UFRN
language English
topic Methods: statistical
Quasar: individual: Q0957+561.
spellingShingle Methods: statistical
Quasar: individual: Q0957+561.
Martins, Bruno Leonardo Canto
Belete, A. Bewketu
Leão, I. C.
Medeiros, J. R. de
Revealing the non-linear behaviour of the lensed quasar Q0957+561
description Knowledge about how the non-linear behaviour of the intrinsic signal from lensed background sources changes on its path to the observer provides much information, particularly about the matter distribution in lensing galaxies and the physical properties of the current universe, in general. Here, we analyse the multifractal behaviour of the optical observations of A and B images of Q0957+561 in the r and g bands. Aims: To verify the presence, or absence, of extrinsic variations in the observed signals of the quasar images and whether extrinsic variations affect the multifractal behaviour of their intrinsic signals. Method: We apply a wavelet transform modulus maxima-based multifractality analysis approach. Results: We detect strong multifractal signatures in the light curves of the quasar images. The degree of multifractality for both images in the r band changes over time in a non-monotonic way, indicating the presence of extrinsic variabilities in the light curves of the images. Additionally, in the r band, in periods of quiescent microlensing activity, we find that the degree of multifractality of image A is stronger than that of B, while B has a larger multifractal strength in recent epochs when it appears to be affected by microlensing. Finally, comparing the optical bands in a period of quiescent microlensing activity, we find that the degree of multifractality is stronger in the r band for both quasar images. In the absence of microlensing, the observed excesses of non-linearity are most likely generated when the broad-line region reprocesses the radiation from the compact sources.
format article
author Martins, Bruno Leonardo Canto
Belete, A. Bewketu
Leão, I. C.
Medeiros, J. R. de
author_facet Martins, Bruno Leonardo Canto
Belete, A. Bewketu
Leão, I. C.
Medeiros, J. R. de
author_sort Martins, Bruno Leonardo Canto
title Revealing the non-linear behaviour of the lensed quasar Q0957+561
title_short Revealing the non-linear behaviour of the lensed quasar Q0957+561
title_full Revealing the non-linear behaviour of the lensed quasar Q0957+561
title_fullStr Revealing the non-linear behaviour of the lensed quasar Q0957+561
title_full_unstemmed Revealing the non-linear behaviour of the lensed quasar Q0957+561
title_sort revealing the non-linear behaviour of the lensed quasar q0957+561
publisher Oxford University Press (OUP)
publishDate 2020
url https://repositorio.ufrn.br/jspui/handle/123456789/29454
http://dx.doi.org/10.1093/mnras/stz203
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