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The Central Component of Gravitational Lens Q0957+561

Winn, Joshua N.; Haarsma, Deborah B.; Shapiro, Irwin +1 more

In 1981, a faint radio source (G') was detected near the center of the lensing galaxy of the famous "twin quasar" Q0957+561. It is still unknown whether this central radio source is a third quasar image or an active nucleus of the lensing galaxy, or a combination of both. In an attempt to resolve this ambiguity, we observed Q0957+561 at radio wave…