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The flux ratios in the multiple images of gravitationally lensed quasars canprovide evidence for dark matter substructure in the halo of the lensing galaxyif the flux ratios differ from those predicted by a smooth model of the lensinggalaxy mass distribution. However, it is also possible that baryonic structuresin the lensing galaxy, such as edge-on discs, can produce flux-ratio anomalies.In this work, we present the first statistical analysis of flux-ratio anomaliesdue to baryons from a numerical simulation perspective. We select galaxies withvarious morphological types in the Illustris simulation and ray-trace throughthe simulated halos, which include baryons in the main lensing galaxies butexclude any substructures, in order to explore the pure baryonic effects. Ourray-tracing results show that the baryonic components can be a majorcontribution to the flux-ratio anomalies in lensed quasars and that edge-ondisc lenses induce the strongest anomalies. We find that the baryoniccomponents increase the probability of finding high flux-ratio anomalies in theearly-type lenses by about 8% and by about 10 - 20% in the disc lenses. Thebaryonic effects also induce astrometric anomalies in 13% of the mock lenses.Our results indicate that the morphology of the lens galaxy becomes importantin the analysis of flux-ratio anomalies when considering the effect of baryons,and that the presence of baryons may also partially explain the discrepancybetween the observed (high) anomaly frequency and what is expected due to thepresence of subhalos as predicted by the CDM simulations.

Flux-ratio anomalies from discs and other baryonic structures in the Illustris simulation