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. Studying the variability in these BALs can help us understand the structure, evolution, and basic physical properties of these outflows. We are conducting a BAL monitoring program, which so far includes 163 spectra of 24 luminous quasars, covering time-scales from \sim 1 week to 8 years in the quasar rest-frame. We investigate changes in both the CIV {\lambda}1550 and SiIV {\lambda}1400 BALs, and we report here on some of the results from this program.
@article{arxiv.1204.6048,
title = {Variability in Quasar Broad Absorption Line Outflows},
author = {Daniel M. Capellupo and Fred Hamann and Joseph C. Shields and Jules Halpern and Paola Rodríguez Hidalgo and Tom A. Barlow},
journal= {arXiv preprint arXiv:1204.6048},
year = {2012}
}
Comments
5 pages, proceedings for the conference "AGN Winds in Charleston", Charleston, S.C., 2011