TY - JOUR
T1 - A strong X-ray flux ratio anomaly in the quadruply lensed quasar PG 1115+080
AU - Pooley, David
AU - Blackburne, Jeffrey A.
AU - Rappaport, Saul
AU - Schechter, Paul L.
AU - Fong, Wen-fai
PY - 2006/9/1
Y1 - 2006/9/1
N2 - 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.
AB - 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.
KW - Gravitational leasing
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U2 - 10.1086/505860
DO - 10.1086/505860
M3 - Article
AN - SCOPUS:33748798868
VL - 648
SP - 67
EP - 72
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1 I
ER -