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The Evolution of a Mass-Selected Sample of Early-Type Field Galaxies
D. Rusin, C. S. Kochanek, E. E. Falco +7
We investigate the evolution of mass-selected early-type field galaxies using a sample of 28 gravitational lenses spanning the redshift range 0 < z < 1. Based on the redshift-depen…
The Spectroscopic Variability of GRB 021004
T. Matheson, P. M. Garnavich, C. Foltz +9
We present spectra of the optical transient (OT) associated with GRB 021004. The spectra show a blue continuum with superposed absorption features and one emission line. We confirm…
Detection of the 2175ÅExtinction Feature at z=0.83
V. Motta, E. Mediavilla, J. A. Munoz +6
We determine the extinction curve in the z_l=0.83 lens galaxy of the gravitational lens SBS0909+532 from the wavelength dependence of the flux ratio between the lensed quasar image…
PKS 1830-211: A Face-On Spiral Galaxy Lens
Joshua N. Winn, Christopher S. Kochanek, Brian A. McLeod +3
We present new Hubble Space Telescope images of the gravitational lens PKS 1830-211, which allow us to characterize the lens galaxy and update the determination of the Hubble const…