The accretion disc in the quasar SDSS J0924+0219

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Abstract

We present single-epoch multiwavelength optical-near-infrared observations of the 'anomalous' lensed quasar SDSS J0924+0219, made using the Magellan 6.5-m Baade Telescope at Las Campanas Observatory, Chile. The data clearly resolve the anomalous bright image pair in the lensed system, and exhibit a strong decrease in the anomalous flux ratio with decreasing wavelength. This is interpreted as a result of microlensing of a source of decreasing size in the core of the lensed quasar. We model the radius of the continuum emission region, σ, as a power law in wavelength, σ ∝ λζ. We place an upper limit on the Gaussian radius of the u′-band emission region of 3.04 × 1016h-1/270(〈M〉/M ⊙)1/2 cm, and constrain the size-wavelength power-law index to ζ < 1.34 at 95 per cent confidence. These observations rule out an alpha-disc prescription for the accretion disc in SDSS J0924+0219 with 94 per cent confidence. © 2009 RAS.

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Floyd, D. J. E., Bate, N. F., & Webster, R. L. (2009). The accretion disc in the quasar SDSS J0924+0219. Monthly Notices of the Royal Astronomical Society, 398(1), 233–239. https://doi.org/10.1111/j.1365-2966.2009.15045.x

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