70 citations · 260 across the 9 of their papers we have counts for
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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…
Further Investigation of the Time Delay, Magnification Ratios, and Variability in the Gravitational Lens 0218+357
A. S. Cohen, J. N. Hewitt, C. B. Moore +1
High precision VLA flux density measurements for the lensed images of 0218+357 yield a time delay of 10.1(+1.5-1.6)days (95% confidence). This is consistent with independent measur…
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…
The Radio Wavelength Time Delay of Gravitational Lens 0957+561
Deborah B. Haarsma, Jacqueline N. Hewitt, Joseph Lehár +1
The gravitational lens 0957+561 was monitored with the Very Large Array from 1979 to 1997. The 6 cm light curve data from 1995-1997 and the 4 cm data from 1990-1997 are reported he…
Radio Wavelength Constraints on the Sources of the Far Infrared Background
D. B. Haarsma, R. B. Partridge
The cosmic far infrared background detected recently by the COBE-DIRBE team is presumably due, in large part, to the far infrared (FIR) emission from all galaxies. We take the well…