265 citations · 469 across the 8 of their papers we have counts for
8 papers · 1 filter
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…
PMN J1838-3427: A new gravitationally lensed quasar
Joshua N. Winn, Jacqueline N. Hewitt, Paul L. Schechter +11
We report the discovery of a new double-image quasar that was found during a search for gravitational lenses in the southern sky. Radio source PMN J1838-3427 is composed of two fla…
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 CASTLES project
J. A. Munoz, E. E. Falco, C. S. Kochanek +5
We describe the goals of the CASTLES (CfA-Arizona-Space-Telescope-LEns-Survey) project including a sample of NICMOS images of gravitational lenses and a brief list of the prelimina…
Dust and Extinction Curves in Galaxies with z>0: The Interstellar Medium of Gravitational Lens Galaxies
E. E. Falco, C. D. Impey, C. S. Kochanek +6
We determine 37 differential extinctions in 23 gravitational lens galaxies over the range 0 < z_l < 1. Only 7 of the 23 systems have spectral differences consistent with no differe…
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…