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19 papers · 2 filters
Deep HST/PC Images of a Young Radio Galaxy at z=2.390
Rogier A. Windhorst, William C. Keel, Sebastian M. Pascarelle
We present deep 63-orbit HST/PC images at ~0.06" FWHM resolution in the filters B_450, V_606 & I_814 - as well as in redshifted Lya - of the radio source LBDS 53W002, a compact nar…
The Gaseous Extent of Galaxies and the Origin of \lya Absorption Systems. III. Hubble Space Telescope Imaging of \lya-Absorbing Galaxies at z < 1
H. -W. Chen, K. M. Lanzetta, J. K. Webb +1
We present initial results of a program to obtain and analyze HST WFPC2 images of galaxies identified in an imaging and spectroscopic survey of faint galaxies in fields of HST spec…
Two Close-Separation Quasar-Quasar Pairs in the Large Bright Quasar Survey
Paul C. Hewett, Craig B. Foltz, Margaret E. Harding +1
We present photometric and spectroscopic observations of two close quasar-quasar pairs found in the Large Bright Quasar Survey (LBQS) (Hewett et al. 1995, AJ, 109, 1498). The two c…
Microlensing induced spectral variability in Q2237+0305
G. F. Lewis, M. J. Irwin, P. C. Hewett +1
We present both photometry and spectra of the individual images of the quadruple gravitational lens system Q2237+0305. Comparison of spectra obtained at two epochs, separated by $\…
Microlensing of Broad Absorption Line Quasars
Geraint F. Lewis, Kunegunda E. Belle
The physical nature of the material responsible for the high--velocity, broad-absorption line features seen in a small fraction of quasar spectra has been the subject of debate sin…
Neutrino Interactions in Hot and Dense Matter
Sanjay Reddy, Madappa Prakash, James M Lattimer
We study the charged and neutral current weak interaction rates relevant for the determination of neutrino opacities in dense matter found in supernovae and neutron stars. We estab…