273 citations · 1.3k across the 19 of their papers we have counts for
9 papers · 1 filter
Extreme-Velocity Quasar Outflows and the Role of X-ray Shielding
Fred Hamann, George Chartas, Sean McGraw +5
Quasar accretion disk winds observed via broad absorption lines (BALs) in the UV produce strong continuous absorption in X-rays. The X-ray absorber is believed to serve critically…
The Physics and Physical Properties of Quasar Outflows
Fred Hamann, Daniel Capellupo, George Chartas +5
We describe two studies designed to characterize the total column densities, kinetic energies, and acceleration physics of broad absorption line (BAL) outflows in quasars. The firs…
Variability in Quasar Broad Absorption Line Outflows III. What Happens on the Shortest Time-scales?
Daniel M. Capellupo, Fred Hamann, Joseph C. Shields +2
Broad absorption lines (BALs) in quasar spectra are prominent signatures of high-velocity outflows, which might be present in all quasars and could be a major contributor to feedba…
The Sloan Digital Sky Survey quasar catalog: ninth data release
Isabelle Pâris, Patrick Petitjean, Eric Aubourg +73
We present the Data Release 9 Quasar (DR9Q) catalog from the Baryon Oscillation Spectroscopic Survey (BOSS) of the Sloan Digital Sky Survey III. The catalog includes all BOSS objec…
Variability in Quasar Broad Absorption Line Outflows
Daniel M. Capellupo, Fred Hamann, Joseph C. Shields +3
Broad absorption lines (BALs) in quasar spectra identify high velocity outflows that likely exist in all quasars and could play a major role in feedback to galaxy evolution. Studyi…
Narrow UV Absorption Line Outflows from Quasars
Fred Hamann, Leah Simon, Paola Rodriguez Hidalgo +1
Narrow absorption line (NAL) outflows are an important yet poorly understood part of the quasar outflow phenomenon. We discuss one particular NAL outflow that has high speeds, time…