Revealing the nonlinear behaviour of the lensed quasar Q0957+561
arXiv:1812.04635 · doi:10.1093/mnras/stz203
Abstract
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 and 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 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 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.
arXiv comment9 pages, 7 figures, Accepted in MNRAS
References in corpus (35)
- A Robust Determination of the Time Delay in 0957+561A,B and a Measurement of the Global Value of Hubble's Constant
- Gravitational Lensing in Astronomy
- X-Ray and Optical Flux Ratio Anomalies in Quadruply Lensed Quasars: I. Zooming in on Quasar Emission Regions
- The Stellar Mass Content of Submillimeter-Selected Galaxies
- HST Observations of 10 Two-Image Gravitational Lenses
- Nonlinearity and Multifractality of Climate Change in the Past 420,000 Years
- A microlensing study of the accretion disc in the quasar MG 0414+0534
- Dark Matter Fraction in Lens Galaxies: New Estimates from Microlensing
- The Host Galaxy of the Lensed Quasar Q 0957+561
- Data Mining for Gravitationally Lensed Quasars
- A Keck Survey of Gravitational Lens Systems: I. Spectroscopy of SBS 0909+532, HST 1411+5211, and CLASS B2319+051
- A Rapid Microlensing Event in the Q0957+561 A,B Gravitational Lens System
- BVRI photometry of QSO 0957+561A, B: Observations, new reduction method and time delay
- Around the Clock Observations of the Q0957+561 A,B Gravitationally Lensed Quasar II: Results for the second observing season
- Time Delay and Accretion Disk Size Measurements in the Lensed Quasar SBS 0909+532 from Multiwavelength Microlensing Analysis
- Time delay in QSO 0957+561 from 1984-99 optical data
- New two-colour light curves of Q0957+561: time delays and the origin of intrinsic variations
- Time delay of SBS 0909+532
- New aperture photometry of QSO 0957+561; application to time delay and microlensing
- First robotic monitoring of a lensed quasar: intrinsic variability of SBS 0909+532
- SBS 0909+532: A New Double Gravitational Lens or Binary Quasar?
- New database for a sample of optically bright lensed quasars in the northern hemisphere
- Improved Constraints on the Gravitational Lens Q0957+561. I. Weak Lensing
- How accurate are the time delay estimates in gravitational lensing?
- Continuous wavelet transform based time-scale and multi-fractal analysis of the nonlinear oscillations in a hollow cathode glow discharge plasma
- Accretion Onto the Supermassive Black Hole in the High-redshift Radio-loud AGN 0957+561
- Multifractality Signatures in Quasars Time Series. I. 3C 273
- New Suns in the Cosmos III: multifractal signature analysis
- A Gravitationally Lensed Quasar Discovered in OGLE
- The dark halo of the main lens galaxy in QSO 0957+561
- New VR magnification ratios of QSO 0957+561
- A 5.5-year robotic optical monitoring of Q0957+561: substructure in a non-local cD galaxy
- Wavelet Based Fractal Analysis of Airborne Pollen
- Wavelet transform modulus maxima based fractal correlation analysis
- Wavelet-based multifractal analysis of laser biopsy imagery
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- Multifractality Signatures in Lensed Quasars