Extreme BAL Quasars from the Sloan Digital Sky Survey

Details Extreme BAL Quasars from the Sloan Digital Sky Survey Extreme BAL Quasars from the Sloan Digital Sky Survey

2001-07-10

arxiv.org/abs/astro-ph/0107182v1

Astronomy and Astrophysics

Astrophysics

6 pages, 5 figures. To appear in Mass Outflow in Active Galactic Nuclei: New Perspectives, eds. D. M. Crenshaw, S. B. Kraemer,

Scientific paper

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.

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