A strong X-ray flux ratio anomaly in the quadruply lensed quasar PG 1115+080

David Pooley*, Jeffrey A. Blackburne, Saul Rappaport, Paul L. Schechter, Wen-fai Fong

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

46 Scopus citations


PG 1115+080 is a quadruply lensed quasar at z = 1.72 whose image positions are well fit by simple models of the lens galaxy (at z = 0.31). At optical wavelengths, the bright close pair of images exhibits a modest flux ratio anomaly (factors of ∼ 1.2-1.4 over the past 22 yr) with respect to these same models. We show here that as observed in X-rays with Chandra, the flux ratio anomaly is far more extreme, roughly a factor of 6. The contrasting flux ratio anomalies in the optical and X-ray band confirm the microlensing hypothesis and set a lower limit on the size of the optical continuum emission region that is ~10-100 times larger man expected from a thin accretion disk model.

Original languageEnglish (US)
Pages (from-to)67-72
Number of pages6
JournalAstrophysical Journal
Issue number1 I
StatePublished - Sep 1 2006


  • Gravitational leasing

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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