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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

References

Chang, K., & Refsdal, S. 1984, A&A, 132, 168 (erratum 139, 558)Google Scholar
Fluke, C. J., & Webster, R. L. 1999, MNRAS, 302, 68 Google Scholar
Mineshige, S., Yonehara, A., & Takahashi, R. 2001, PASA, 18, 186 Google Scholar
Press, W. H., Flannery, B. P., Teukolsky, S. A., & Vetterling, W. T. 1992, in Numerical Recipes (2nd ed.; Cambridge: Cambridge University Press)Google Scholar
Schmidt, R., Webster, R. L., & Lewis, G. F. 1998, MNRAS, 295, 488 Google Scholar
Shalyapin, V. N. 2001, Ast. L., 27, 150 Google Scholar
Wambsganss, J. 1990, in Gravitational Microlensing, Dissertation der Fakultät für Physik der Ludwig-Maximilians-Universität, MünchenGoogle Scholar
Wambsganss, J. 2001, PASA, 18, 207 Google Scholar
Wambsganss, J., Schneider, P., & Pazcyński, B. 1990, ApJ, 358, L33 Google Scholar
Wozniak, P. R., Udalski, A., Szymanski, M., Kubiak, M., Pietrzynski, G., Soszynski, I., & Zebrun, K. 2000, ApJ, 540, L65 Google Scholar
Wyithe, J. S. B., Webster, R. L., & Turner, E. L. 2000, MNRAS, 315, 51 Google Scholar
Yonehara, A. 2001, ApJ, 548, L127 Google Scholar
Zakharov, A. F. 1995, A&A, 293, 1 Google Scholar