Extreme BAL Quasars from the Sloan Digital Sky Survey
Astrophysics
2007-05-23 v1
Abstract
The Sloan Digital Sky Survey has discovered a population of broad absorption line quasars with various extreme properties. Many show absorption from metastable states of FeII with varying excitations; several objects are almost completely absorbed bluewards of MgII; at least one shows stronger absorption from FeIII than FeII, indicating temperatures T>35000 K in the absorbing region; and one object even seems to have broad H-beta absorption. Many of these extreme BALs are also heavily reddened, though `normal' BALs (particularly LoBALs) from SDSS also show evidence for internal reddening.
Keywords
Cite
@article{arxiv.astro-ph/0107182,
title = {Extreme BAL Quasars from the Sloan Digital Sky Survey},
author = {Patrick B. Hall and J. E. Gunn and G. R. Knapp and V. K. Narayanan and M. A. Strauss and S. F. Anderson and D. E. Vanden Berk and T. M. Heckman and J. H. Krolik and Z. I. Tsvetanov and W. Zheng and G. T. Richards and D. P. Schneider and X. Fan and D. G. York and T. R. Geballe and M. Davis and R. H. Becker and R. J. Brunner},
journal= {arXiv preprint arXiv:astro-ph/0107182},
year = {2007}
}
Comments
6 pages, 5 figures. To appear in Mass Outflow in Active Galactic Nuclei: New Perspectives, eds. D. M. Crenshaw, S. B. Kraemer, and I. M. George