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Size Measurements of the Quasar X-Ray Continuum Emission Region by Analysis of Microlensing in Chandra Imagery

Published online by Cambridge University Press:  25 July 2014

Chelsea L. MacLeod  and
Christopher W. Morgan
Chelsea L. MacLeod
Affiliation:
Physics Department, United States Naval Academy, 572c Holloway Rd, Annapolis, MD, USA email: macleod@usna.edu, cmorgan@usna.edu
Christopher W. Morgan
Affiliation:
Physics Department, United States Naval Academy, 572c Holloway Rd, Annapolis, MD, USA email: macleod@usna.edu, cmorgan@usna.edu
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Abstract

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Microlensing offers a unique way to constrain the physical extent of different emission regions in a lensed quasar, putting to test various accretion and continuum emission models. We perform a microlensing analysis using six Chandra observations (spanning six years) of the lensed quasar SDSS 0924+0219 (redshift zs=1.52), in which X-ray microlensing variability is detected with high confidence. The system exhibits pronounced microlensing variability in the X-rays compared to the optical, indicating a comparatively small extent of r1/2<3.8×104 cm (95% confidence) for the X-ray continuum emitting region, near the inner edge of the accretion disk.

Keywords

galaxies: activequasars: general

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