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astro-ph2008★ 1 cited
The Central Component of Gravitational Lens Q0957+561
Deborah B. Haarsma, Joshua N. Winn, Irwin Shapiro +1
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 i…
astro-ph2000
New VLBI Constraints for 0957+561 Lens Models
Deborah Haarsma, Joseph Leh'ar, Rennan Barkana
Time-delay measurements of 0957+561 based on radio monitoring now agree with optical monitoring. Recent models incorporate many recent observations, but the systematic uncertaintie…