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The Lensing Cluster MS0440+0204 Seen by HST, ROSAT and ASCA: I. Cluster Properties
I. M. Gioia, E. J. Shaya, O. Le Fevre +3
We present an analysis of the properties of the lensing cluster MS0440+0204 at z=0.1965. MS0440+0204 has been observed with a variety of telescopes at diverse wavelengths: from the…
Why Quasar Pairs Are Binary Quasars And Not Gravitational Lenses
C. S. Kochanek, E. E. Falco, J. A. Munoz
We use simple comparisons of the optical and radio properties of the wide separation (3'' to 10'') quasar pairs to demonstrate that they are binary quasars rather than gravitationa…
The Century Survey: A Deeper Slice of the Universe
Margaret J. Geller, Michael J. Kurtz, ; Gary Wegner +7
The ``Century Survey'' (CS hereafter) is a complete redshift survey of a 1-wide strip. It covers 0.03 steradians to a limiting m = 16.13. The survey is 98.4% complete a…
MGC2214+3550: A New Binary Quasar
José A. Muñoz, Emilio E. Falco, Christopher S. Kochanek +4
We report the discovery of a binary quasar, MGC2214+3550 A,B, whose components have similar optical spectra at a redshift z=0.88. The quasars are separated on the sky by 3.0", and…
The Optical Properties of Gravitational Lens Galaxies as a Probe of Galaxy Structure and Evolution
C. R. Keeton, C. S. Kochanek, E. E. Falco
We combine photometry and lens modeling to study the properties of 17 gravitational lens galaxies between z=0.1 and 1. Most of the lens galaxies are passively evolving early-type g…
The detection of the lambda 2175 A feature, and further analysis of the BAL line profile structure in the gravitational lens candidate UM425
A. G. Michalitsianos, E. E. Falco, J. A. Munoz +2
We obtained MMT spectra of the gravitational lens candidate UM425 to compare the redshifts and line profile structures of lens components A and B, which are separated by ~6.5". The…
Limits on Cosmological Models From Radio-Selected Gravitational Lenses
E. E. Falco, C. S. Kochanek, J. M. Munoz
We are conducting a redshift survey of 177 flat-spectrum radio sources in 3 samples covering the 5GHz flux ranges 50-100, 100-200 and 200-250 mJy. So far, we have measured 124 reds…
An estimate of H_0 from Keck spectroscopy of the gravitational lens system 0957+561
Emilio E. Falco, Irwin I. Shapiro, Leonidas A. Moustakas +1
We present long-slit LRIS/Keck spectroscopic observations of the gravitational lens system 0957+561. Averaged over all of our data, the rest-frame velocity dispersion sigma_v of th…
The Gravitationally-Lensed Radio Source MG0751+2716
J. Lehar, B. F. Burke, S. R. Conner +6
We report the discovery of a new gravitationally lensed radio source. Radio maps of MG0751+2716 show four lensed images, which, at higher resolution, are resolved into long arcs of…