• DOI:10.1111/j.1365-2966.2009.15045.x
• Corpus ID: 18381541

The accretion disc in the quasar SDSS J0924+0219★

@article{Floyd2009TheAD,
  title={The accretion disc in the quasar SDSS J0924+0219★},
  author={David J. E. Floyd and Nicholas F. Bate and R. L. Webster},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2009},
  volume={398},
  pages={233-239}
}

• D. Floyd, N. Bate, R. Webster
• Published 16 May 2009
• Physics
• Monthly Notices of the Royal Astronomical Society

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 ∝ λ ζ . We place an upper limit on the Gaussian radius of the u'-band emission region of 3.04 x 10 16 h 70 -1/2 (?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.