HST imaging of four gravitationally lensed quasars

Abstract

We present new HST WFPC3 imaging of four gravitationally lensed quasars: MG 0414+0534; RXJ 0911+0551; B 1422+231; WFI J2026-4536. In three of these systems we detect wavelength-dependent microlensing, which we use to place constraints on the sizes and temperature profiles of the accretion discs in each quasar. Accretion disc radius is assumed to vary with wavelength according to the power-law relationship $r\propto {\lambda }^p$, equivalent to a radial temperature profile of $T\propto r^{-1/p}$. The goal of this work is to search for deviations from standard thin disc theory, which predicts that radius goes as wavelength to the power $p=4/3$. We find a wide range of power-law indices, from $p=1.4_{-0.4}^{+0.5}$ in B 1422+231 to $p=2.3_{-0.4}^{+0.5}$ in WFI J2026-4536. The measured value of $p$ appears to correlate with the strength of the wavelength-dependent microlensing. We explore this issue with mock simulations using a fixed accretion disc with $p=1.5$, and find that cases where wavelength-dependent microlensing is small tend to under-estimate the value of $p$. This casts doubt on previous ensemble single-epoch measurements which have favoured low values using samples of lensed quasars that display only moderate chromatic effects. Using only our systems with strong chromatic microlensing we prefer $p>4/3$, corresponding to shallower temperature profiles than expected from standard thin disc theory.

20 pages, 11 figures, accepted for publication in MNRAS

References in corpus (57)

• Detailed Structural Decomposition of Galaxy Images
• Composite Quasar Spectra From the Sloan Digital Sky Survey
• LSST Science Book, Version 2.0
• Direct Detection of CDM Substructure
• Evidence for substructure in lens galaxies?
• Gravitationally lensed quasars and supernovae in future wide-field optical imaging surveys
• The Quasar Accretion Disk Size - Black Hole Mass Relation
• The Quasar Accretion Disk Size -- Black Hole Mass Relation
• Space Telescope and Optical Reverberation Mapping Project. III. Optical Continuum Emission and Broad-Band Time Delays in NGC 5548
• A Description of Quasar Variability Measured Using Repeated SDSS and POSS Imaging
• Magnetic Stress at the Marginally Stable Orbit: Altered Disk Structure, Radiation, and Black Hole Spin Evolution
• Quasar Microlensing at High Magnification and the Role of Dark Matter: Enhanced Fluctuations and Suppressed Saddlepoints
• Sizes and Temperature Profiles of Quasar Accretion Disks from Chromatic Microlensing
• Tests for Substructure in Gravitational Lenses
• X-Ray and Optical Flux Ratio Anomalies in Quadruply Lensed Quasars: I. Zooming in on Quasar Emission Regions
• Size is Everything: Universal Features of Quasar Microlensing with Extended Sources
• Accretion disk reverberation with Hubble Space Telescope observations of NGC 4593: evidence for diffuse continuum lags
• Microlensing-Based Estimate of the Mass Fraction in Compact Objects in Lens
• The Microlensing Properties of a Sample of 87 Lensed Quasars
• Microlensing of the broad line region in 17 lensed quasars
• Microlensing variability in the gravitationally lensed quasar QSO 2237+0305 = the Einstein Cross. II. Energy profile of the accretion disk
• The redshift distribution of gravitational lenses revisited: Constraints on galaxy mass evolution
• The Influence of Gravitational Microlensing on the Broad Emission Lines of Quasars
• The multiple quasar Q2237+0305 under a microlensing caustic
• Space Telescope and Optical Reverberation Mapping Project VI: reverberating Disk Models for NGC 5548
• WFI J2026-4536 and WFI J2033-4723: Two New Quadruple Gravitational Lenses
• A calibration of the stellar mass fundamental plane at z ~ 0.5 using the micro-lensing induced flux ratio anomalies of macro-lensed quasars
• A microlensing study of the accretion disc in the quasar MG 0414+0534
• A Robust Determination of the size of quasar accretion disks using gravitational microlensing
• The Average Size and Temperature Profile of Quasar Accretion Disks
• Dark Matter Fraction in Lens Galaxies: New Estimates from Microlensing
• Detection of Time Lags Between Quasar Continuum Emission Bands based on Pan-STARRS Light-curves
• Gravitational Lensing Size Scales for Quasars
• The accretion disc in the quasar SDSS J0924+0219
• Computational Methods for Gravitational Lensing
• X-Ray And Optical Flux Ratio Anomalies In Quadruply Lensed Quasars. II. Mapping the Dark Matter Content in Elliptical Galaxies
• A microlensing measurement of the size of the broad emission line region in the lensed QSO 2237+0305
• A Consistent Picture Emerges: A Compact X-ray Continuum Emission Region in the Gravitationally Lensed Quasar SDSS J0924+0219
• Subaru Mid-infrared Imaging of the Quadruple Lenses. II. Unveiling Lens Structure of MG0414+0534 and Q2237+030
• Teraflop per second gravitational lensing ray-shooting using graphics processing units
• A Study of Gravitational Lens Chromaticity using Ground-based Narrow Band Photometry
• GERLUMPH Data Release 1: High-resolution cosmological microlensing magnification maps and eResearch tools
• The Optical, Ultraviolet, and X-ray Structure of the Quasar HE 0435-1223
• Detection of Substructure in the Gravitationally Lensed Quasar MG0414+0534 using Mid-Infrared and Radio VLBI Observations
• Milliarcsec-scale polarisation observations of the gravitational lens B1422+231
• A microlensing measurement of dark matter fractions in three lensing galaxies
• A Study of Gravitational Lens Chromaticity with the Hubble Space Telescope
• Observations of radio-quiet quasars at 10mas resolution by use of gravitational lensing
• Probing the Broad Line Region and the Accretion Disk in the Lensed Quasars HE0435-1223, WFI2033-4723, and HE2149-2745 using Gravitational Microlensing
• COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses VIII. Deconvolution of high resolution near-IR images and simple mass models for 7 gravitationally lensed quasars
• Differential Microlensing Measurements of Quasar Broad Line Kinematics in Q2237+0305
• Multifrequncy Radio Observations of the Gravitational Lens System MG0414+0534
• Strong Chromatic Microlensing in HE0047-1756 and SDSS1155+6346
• GERLUMPH Data Release 2: 2.5 billion simulated microlensing light curves
• Smooth matter and source size in microlensing simulations of gravitationally lensed quasars
• Microlensing Constraints on Broad Absorption and Emission Line Flows in the Quasar H1413+117
• A GPU-Enabled, High-Resolution Cosmological Microlensing Parameter Survey

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• Temperature Profiles of Accretion Disks in Luminous Active Galactic Nuclei derived from Ultraviolet Spectroscopic Variability
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