scholarly journals High-Redshift Superclustering of Quasi-stellar Object Absorption-Line Systems on 100 [ITAL]h[/ITAL][TSUP]−1[/TSUP] Mpc Scales

1996 ◽  
Vol 472 (2) ◽  
pp. L69-L72 ◽  
Author(s):  
Jean M. Quashnock ◽  
Daniel E. Vanden Berk ◽  
Donald G. York
Keyword(s):  
Absorption Line ◽  
High Redshift ◽  
Stellar Object

scholarly journals HS 1700+6416: the first high-redshift unlensed narrow absorption line-QSO showing variable high-velocity outflows

2012 ◽  
Vol 544 ◽  
pp. A2 ◽  
Author(s):  
G. Lanzuisi ◽  
M. Giustini ◽  
M. Cappi ◽  
M. Dadina ◽  
G. Malaguti ◽  
...  
Keyword(s):  
Absorption Line ◽  
High Velocity ◽  
High Redshift

scholarly journals Limits on the Variation of Physical Constants Derived from Molecular Absorption Lines

1999 ◽  
Vol 183 ◽  
pp. 167-167 ◽  
Author(s):  
T. Wiklind ◽  
F. Combes
Keyword(s):  
Absorption Line ◽  
High Redshift ◽  
Absorption Lines ◽  
Frequency Resolution ◽  
Radio Lines ◽  
Molecular Absorption ◽  
Diagnostic Application ◽  
Physical Constants ◽  
Resonance Transitions ◽  
Electronic Resonance

A potential diagnostic application of molecular rotational absorption lines at high redshift is to test the invariance of physical constants. This can be done by comparing the observed redshifted frequency of a molecular absorption line with redshifted lines from other types of transitions such as the 21cm hyperfine transition or electronic resonance transitions. In order to set stringent limits, it is necessary to achieve the greatest possible frequency resolution. This makes radio lines well suited for this purpose.

scholarly journals High-Redshift Molecular Clouds and Absorption-Line Spectra of Quasars

1983 ◽  
Vol 104 ◽  
pp. 365-366
Author(s):  
D. A. Varshalovich ◽  
S. A. Levshakov
Keyword(s):  
Absorption Line ◽  
Molecular Clouds ◽  
High Redshift ◽  
Optical Spectra ◽  
Molecular Lines

The optical spectra of distant quasars (OQ 172, PHL 957, PKS 0237–233 and 11 others) were reanalysed with the purpose of searching molecular lines /2, 4/.

Absorption-Line Profiles in the Quasi-Stellar Object PHL 957

1972 ◽  
Vol 174 ◽  
pp. 237 ◽  
Author(s):  
Donald C. Morton ◽  
Winifred A. Morton
Keyword(s):  
Absorption Line ◽  
Stellar Object ◽  
Line Profiles

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

Imaging and Spectroscopy of Damped LY alpha Quasi-stellar Object Absorption-Line Clouds

1995 ◽  
Vol 451 ◽  
pp. 484 ◽  
Author(s):  
James D. Lowenthal ◽  
Craig J. Hogan ◽  
Richard F. Green ◽  
Bruce Woodgate ◽  
Adeline Caulet ◽  
...  
Keyword(s):  
Absorption Line ◽  
Stellar Object ◽  
Imaging And Spectroscopy

scholarly journals Radio Line and Continuum Observations of Quasar-Galaxy Pairs and the Origin of Low Redshift Quasar Absorption Line Systems

1990 ◽  
Vol 124 ◽  
pp. 473-477
Author(s):  
C.L. Carilli ◽  
J.H. van Gorkom ◽  
E.M. Hauxthausen ◽  
J.T. Stocke ◽  
J. Salzer
Keyword(s):  
Absorption Line ◽  
Alternative Hypothesis ◽  
High Redshift ◽  
Gravitational Interaction ◽  
Optical Disk ◽  
Line Of Sight ◽  
Radio Line ◽  
Redshift Galaxy ◽  
Interacting Systems ◽  
Companion Galaxy

There are a number of known quasars for which our line of sight to the high redshift quasar passes within a few Holmberg radii of a low redshift galaxy. In a few of these cases, spectra of the quasar reveal absorption by gas associated with the low redshift galaxy. A number of these pairs imply absorption by gas which lies well outside the optical disk of the associated galaxy, leading to models of galaxies with ‘halos’ or ‘disks’ of gas extending to large radii. We present observations of 4 such pairs. In three of the four cases, we find that the associated galaxy is highly disturbed, typically due to a gravitational interaction with a companion galaxy, while in the fourth case the absorption can be explained by clouds in the optical disk of the associated galaxy. We are led to an alternative hypothesis concerning the origin of the low redshift absorption line systems: the absorption is by gas clouds which have been gravitationally stripped from the associated galaxy. These galaxies are rapidly evolving, and should not be used as examples of absorption by clouds in halos of field spirals. We conclude by considering the role extended gas in interacting systems plays in the origin of higher redshift quasar absorption line systems.

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