A study of the absorption-line spectra of six high-redshift quasi-stellar objects

1978 ◽  
Vol 224 ◽  
pp. 344 ◽  
Author(s):  
D. H. Roberts ◽  
G. R. Burbidge ◽  
A. H. Crowne ◽  
V. T. Junkkarinen ◽  
E. M. Burbidge ◽  
...  
Keyword(s):  
Absorption Line ◽  
High Redshift ◽  
Stellar Objects ◽  
Quasi Stellar Objects

scholarly journals The Origin of Absorption Spectra in Quasi-Stellar Objects

1980 ◽  
Vol 92 ◽  
pp. 107-117 ◽  
Author(s):  
Ray J. Weymann
Keyword(s):  
Absorption Line ◽  
Absorption Spectra ◽  
Classification Scheme ◽  
Spectral Characteristics ◽  
Type A ◽  
Galactic Halos ◽  
Evolutionary Sequence ◽  
Rich Cluster ◽  
Stellar Objects ◽  
Quasi Stellar Objects

A classification scheme for QSO absorption line spectra is described which ascribes the origin of the lines to at least four mechanisms: (A) Explosive ejection of material at speeds up to 0.1 c. (B) Absorption by highly ionized material moving in a rich cluster in which the QSO is embedded. (C-1) Cosmologically distant intervening material with ‘normal’ abundances, probably associated with large galactic halos. (C-2) Cosmologically distant intervening material consisting of primordial uncondensed gas. Examples of each type of spectra are given and their ionization and other spectral characteristics discussed. The similarity between the development of novae spectra and a possible evolutionary sequence of the explosive ejecta of type A is striking and suggestive. Several difficulties and unsolved problems involving this scheme are noted. Finally, we speculate on the interpretation of two interesting objects (PKS 0237-23 and the ‘twin quasars’ 0957+56A,B) in the context of this scheme.

The X-ray properties of high-redshift quasi-stellar objects

1987 ◽  
Vol 314 ◽  
pp. 111 ◽  
Author(s):  
Scott F. Anderson ◽  
Bruce Margon
Keyword(s):  
High Redshift ◽  
Stellar Objects ◽  
X Ray ◽  
Quasi Stellar Objects

scholarly journals ExploratoryASCAObservations of Broad Absorption Line Quasi‐stellar Objects

1999 ◽  
Vol 519 (2) ◽  
pp. 549-555 ◽  
Author(s):  
S. C. Gallagher ◽  
W. N. Brandt ◽  
R. M. Sambruna ◽  
S. Mathur ◽  
N. Yamasaki
Keyword(s):  
Absorption Line ◽  
Broad Absorption ◽  
Stellar Objects ◽  
Broad Absorption Line ◽  
Quasi Stellar Objects
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