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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…
The FIRST-Optical-VLA Survey for Lensed Radio Lobes
D. B. Haarsma, J. N. Winn, E. E. Falco +7
We present results from a survey for gravitationally lensed radio lobes. Lensed lobes are a potentially richer source of information about galaxy mass distributions than lensed poi…
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…