Abstract
The gravitational lens effect is achromatic, yet observations at different wavelengths have yielded different values for the brightness ratio of the two quasar images, A and B, in 0957+561. The radio observations can be separated into VLBI core and VLBI jet regions, which have different brightness ratios. We show that both VLA and VLBI observations show a quasar VLBI core image flux ratio of about 0.75, consistent with optical flux ratios determined from core emission lines and markedly different from the flux ratio of the VLBI jet images
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