Journal article

The accretion disc in the quasar SDSS J0924 0219(star)

David JE Floyd, NF Bate, RL Webster

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | WILEY-BLACKWELL | Published : 2009

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 ..

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University of Melbourne Researchers

Grants

Funding Acknowledgements

DJEF acknowledges the support of a Magellan Fellowship from Astronomy Australia Limited. NFB acknowledges the support of an Australian Postgraduate Award. We are indebted to Joachim Wambsganss for the use of his inverse ray-shooting code. We gratefully acknowledge Naohisa Inada for providing us with his Magellan/MagIC images of SDSS J0924+0219. We acknowledge the input of an anonymous referee, who helped us clarify a number of sections of the text.