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08 February 2025
 
  » arxiv » astro-ph/0107182

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Extreme BAL Quasars from the Sloan Digital Sky Survey
Patrick B. Hall ; J. E. Gunn ; G. R. Knapp ; V. K. Narayanan ; M. A. Strauss ; S. F. Anderson ; D. E. Vanden Berk ; T. M. Heckman ; J. H. Krolik ; Z. I. Tsvetanov ; W. Zheng ; G. T. Richards ; D. P. Schneider ; X. Fan ; D. G. York ; T. R. Geballe ; M. Davis ; R. H. Becker ; R. J. Brunner ;
Date 10 Jul 2001
Subject astro-ph
AbstractThe 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.
Source arXiv, astro-ph/0107182
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