Revealing the non-linear behaviour of the lensed quasar Q0957+561
| العنوان: | Revealing the non-linear behaviour of the lensed quasar Q0957+561 |
|---|---|
| المؤلفون: | B. L. Canto Martins, I. C. Leão, J. R. De Medeiros, A. Bewketu Belete |
| المصدر: | Repositório Institucional da UFRN Universidade Federal do Rio Grande do Norte (UFRN) instacron:UFRN |
| بيانات النشر: | Oxford University Press (OUP), 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | Physics, statistical [Methods], 010308 nuclear & particles physics, media_common.quotation_subject, individual: Q0957+561. [Quasar], FOS: Physical sciences, Wavelet transform, Astronomy and Astrophysics, Quasar, Astrophysics::Cosmology and Extragalactic Astrophysics, Multifractal system, Astrophysics, Gravitational microlensing, Light curve, Astrophysics - Astrophysics of Galaxies, 01 natural sciences, Galaxy, Universe, Nonlinear system, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), 0103 physical sciences, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, media_common |
| الوصف: | Knowledge about how the nonlinear 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 (nonlinear) 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 investigate 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 (nonlinear) 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, possibly indicating the presence of extrinsic variabilities in the light curves of the images, i.e., the signals of the quasar images are a combination of both intrinsic and extrinsic signals. Additionally, in the r band, in periods of quiescent microlensing activity, we find that the degree of multifractality (nonlinearity) of image A is stronger than that of B, while B has a larger multifractal strength in recent epochs (from day 5564 to day 7527) 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 nonlinearity are most likely generated when the broad-line region (BLR) reprocesses the radiation from the compact sources. Comment: 9 pages, 7 figures, Accepted in MNRAS |
| اللغة: | English |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5429d7b7fd4dd3ff6778539ec84d5b10 https://repositorio.ufrn.br/jspui/handle/123456789/29454 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....5429d7b7fd4dd3ff6778539ec84d5b10 |
| قاعدة البيانات: | OpenAIRE |
| الوصف غير متاح. |