Journal article

The size of the mid-IR emission region of a quasar inferred from microlensed images of Q2237 0305

JSB Wyithe, E Agol, CJ Fluke

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | BLACKWELL PUBLISHING LTD | Published : 2002

Abstract

We use published mid-IR and V-band flux ratios for images A and B of Q2237+0305 obtained in 1999 September to demonstrate that the size of the mid-IR emission region has a scale comparable to or larger than the microlens Einstein radius (ER) (∼1017 cm for microlensing by solar mass stars). Q2237+0305 has been monitored extensively in the R and V bands for ∼15 yr. The variability record shows significant microlensing variability of the optical emission region, and has been used by several studies to demonstrate that the optical emission region is much smaller than the ER for solar-mass objects. For the majority of the monitoring history, the optical flux ratios have differed significantly fro..

View full abstract

University of Melbourne Researchers