Analyzing the Flux Anomalies of the Large-Separation Lensed Quasar SDSS J1029+2623

Abstract

Using a high resolution radio image, we successfully resolve the two fold image components B and C of the quasar lens system SDSS J1029+2623. The flux anomalies associated with these two components in the optical regime persist, albeit less strongly, in our radio observations, suggesting that the cluster must be modeled by something more than a single central potential. We argue that placing substructure close to one of the components can account for a flux anomaly with negligible changes in the component positions. Our best fit model has a substructure mass of ~10^8 solar masses up to the mass-sheet degeneracy, located roughly 0.1 arcsecs West and 0.1 arcsecs North of component B. We demonstrate that a positional offset between the centers of the source components can explain the differences between the optical and radio flux ratios.

5 pages, 3 figures, 2 tables, accepted to ApJ Letters

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• Observations of radio-quiet quasars at 10mas resolution by use of gravitational lensing
• The faintest radio source yet: EVLA observations of the gravitational lens SDSS J1004+4112
• VLA and ALMA observations of the lensed radio-quiet quasar SDSS J0924+0219: a molecular structure in a 3 microJy radio source
• The Chandra view of the Largest Quasar Lens SDSS J1029+2623
• Spectro-photometric variability of quasars caused by lensing of diffuse massive substructure: Consequences on flux anomaly and precise astrometric measurements