(Proposal ID) S16A-189

(PI) Oguri, Masamune

(Proposal Title)
Resolving flux anomalies in quadruple quasar lenses

(Abstract)
We propose Kyoto3DII integral field spectroscopy (IFS) of the unique quadruple 
quasar lenses SDSS J1251+2935 and SDSS J1330+1810 in order to clarify the 
origin of their flux anomalies, i.e., anomalous flux ratios between quasar 
images, seen in the broadband optical flux ratios. We also reobserve RXJ1131-
1231, for which previous Kyoto3DII observation detected anomalous flux ratios 
in Hbeta broad lines, to confirm its origin. The anomalous flux ratios are 
most likely produced by perturbation on the lens potential by either stars or 
massive dark halo substructures in lensing galaxies. We aim to distinguish 
these possibilities by comparing flux ratios between quasar images measured in 
continuum, narrow line (e.g., [OII]), and broad line (e.g., MgII) which have 
quite different emitting sizes and therefore have different responses to the 
perturbers. Such accurate measurements of line flux ratios between all four 
quasar images can only be achieved by the IFS observation as proposed here.