91 citations · 303 across the 16 of their papers we have counts for
9 papers · 1 filter
Hubble Space Telescope Ultraviolet Spectroscopy of Fourteen Low-Redshift Quasars
Rajib Ganguly, Michael S. Brotherton, Nahum Arav +35
We present low-resolution ultraviolet spectra of 14 low redshift (z<0.8) quasars observed with HST/STIS as part of a Snap project to understand the relationship between quasar outf…
Inhomogeneous Absorbers and Derived Column Densities
Bassem M. Sabra, Fred Hamann
We study the dependence of column densities derived from absorption lines on the spatial distribution of the ions in an absorber. In particular, we investigate four varieties of co…
Quasar Elemental Abundances and Host Galaxy Evolution
F. Hamann, M. Dietrich, B. Sabra +1
High redshift quasars mark the locations where massive galaxies are rapidly being assembled and forming stars. There is growing evidence that quasar environments are metal-rich out…
How Massive Are BALQSO Winds?
F. Hamann, B. Sabra, V. Junkkarinen +2
We are involved in a program to derive properties of broad absorption line (BAL) winds in quasars using combined UV and X-ray observations. A major obstacle is large uncertainties…
The Nature of the UV/X-Ray Absorber in PG 2302+029
Bassem M. Sabra, Fred Hamann, Buell T. Jannuzi +2
We present Chandra X-ray observations of the radio-quiet QSO PG 2302+029. This quasar has a rare system of ultra-high velocity (-56,000 km/s) UV absorption lines that form in an ou…
Emission and Absorption in the M87 LINER
B. M. Sabra, J. C. Shields, L. C. Ho +2
The nucleus of M87 displays a LINER spectrum at optical wavelengths, with a nuclear disk of nebulosity that is resolved by the Hubble Space Telescope. We present new results from o…