Article (Scientific journals)
Geometry of the mass-outflows around broad absorption line QSOs and formation of the complex Ly-alpha + N V line profile
Surdej, Jean; Hutsemekers, Damien
1987In Astronomy and Astrophysics, 177, p. 42-50
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Keywords :
LYMAN ALPHA RADIATION; QUASARS; STELLAR MASS EJECTION; EMISSION SPECTRA; LINE SPECTRA; NITROGEN; ABSORPTION SPECTRA
Abstract :
[en] The possibility that the observed broad absorption line (BAL) profiles are formed in spherically symmetric atmospheres is investigated, and it is found that BAL and non-BAL QSOs form two distinct classes of quasars. It is shown that the small residual intensity and large equivalent width noted for some absorption troughs may be reproduced by the resonance scattering of line photons across spherically symmetric BAL regions. N V emission strength is found to be higher in the spectrum of BAL QSOs than in that of non-BAL QSOs. Good agreement between theory and the observed attenuation of the Ly-alpha emission line, the observed enhancement of the N V emission strength, and the possible presence of a shoulderlike feature in the red wing of the N V emission profile is obtained.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Surdej, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Hutsemekers, Damien ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Language :
English
Title :
Geometry of the mass-outflows around broad absorption line QSOs and formation of the complex Ly-alpha + N V line profile
Publication date :
1987
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
177
Pages :
42-50
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 02 September 2009

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