scholarly journals Lyα Leaks in the Absorption Spectra of High-Redshift Quasi-stellar Objects

2007 ◽  
Vol 671 (2) ◽  
pp. L89-L92 ◽  
Author(s):  
Jiren Liu ◽  
Hongguang Bi ◽  
Li-Zhi Fang
Keyword(s):  
Absorption Spectra ◽  
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.

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

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

Accurate Radio Positions with the Tidbinbilla Interferometer

1979 ◽  
Vol 3 (6) ◽  
pp. 400-402 ◽  
Author(s):  
M. J. Batty ◽  
David L. Jauncey ◽  
P. T. Rayner ◽  
S. Gulkis
Keyword(s):  
Absorption Spectra ◽  
High Redshift ◽  
Optical Emission ◽  
Radio Sources ◽  
Stellar Objects ◽  
Bl Lac Objects ◽  
Optical Position ◽  
Bl Lac ◽  
Compact Galaxies ◽  
Optical Identifications

Radio position measurements with an error of <2” arc rms allow reliable optical identifications of compact radio sources to be made solely on the basis of radio-optical position coincidence. In this way neutral or red stellar objects, faint compact galaxies and faint QSOs can be reliably identified. Such identifications are of particular interest because they are rich in BL Lac objects, high-redshift QSOs, QSOs with unusual optical emission or absorption spectra and galaxies with active nuclei (see Jauncey et al. 1978).

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