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Source Size Measurement from Observed Quasar Microlensing

Published online by Cambridge University Press:  05 March 2013

Atsunori Yonehara
Atsunori Yonehara*
Affiliation:
Department of Astronomy, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
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Abstract

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Recently, the OGLE team have reported a clear quasar microlensing signal in Q2237+0305. I have analyzed the microlens event of ‘image C’ by using their finely and densely sampled light curves. From light curve fitting, I unambiguously set the source size of ≤0.98 Einstein-Ring radius as a conservative limit. This limit corresponds to 2000 AU, if I adopt Mlens ~ 0.1M obtained by a recent statistical study of the mean mass of the lens object. This gives clear evidence for the existence of an accretion disk in the central region of the quasar.

Keywords

accretion, accretion disksgalaxies:activegravitational lensingquasars: individual(Q2237+0305)
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 18 , Issue 2 , 2001 , pp. 211 - 214
Copyright
Copyright © Astronomical Society of Australia 2001

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