Evolution of the Neutral Gas and Metal Content of Damped Lyman Alpha Systems

1995 ◽  
pp. 13-22 ◽  
Author(s):  
A. M. Wolfe
Keyword(s):  
Metal Content ◽  
Lyman Alpha ◽  
Neutral Gas ◽  
Damped Lyman Alpha Systems

scholarly journals On the kinematics of neutral gas in GRB host galaxies

2015 ◽  
Vol 11 (A29B) ◽  
pp. 263-263
Author(s):  
M. Arabsalmani ◽  
P. Møller ◽  
W. Freudling ◽  
T. Zafar ◽  
J. P. U. Fynbo ◽  
...  
Keyword(s):  
Excellent Agreement ◽  
Late Onset ◽  
Gas Velocity ◽  
Host Galaxies ◽  
Lyman Alpha ◽  
Neutral Gas ◽  
Long Duration ◽  
Damped Lyman Alpha Systems ◽  
Stellar Masses ◽  
Cold Gas

AbstractWe analyze a sample of 20 absorption systems intrinsic to long duration GRB host galaxies at z > 2 forwhich the metallicities are known. We compare the relation between the metallicity and cold gas velocity width for thissample to that of the Damped Lyman-alpha systems (DLAs) in the sight-lines of quasars (QSOs), and find completeagreement. We then compare the redshift evolution of the velocity-metallicity relation of our sample to that of QSODLAsand find that also GRB hosts favour a late onset of this evolution, around a redshift of ~2.6. We compute predicted stellar masses for the GRB host galaxies using the prescription determined from QSO-DLAsamples and compare the measured stellar masses for the four hosts where stellar masses have been determinedfrom SED fits. We find excellent agreement and conclude that, on basis of all available data and tests, long durationGRB-DLA hosts and intervening QSO-DLAs are consistent with being drawn from the same underlying population.

scholarly journals The statistical properties of neutral gas at z < 1.65 from UV measurements of Damped Lyman Alpha systems

2017 ◽  
Vol 471 (3) ◽  
pp. 3428-3442 ◽  
Author(s):  
Sandhya M. Rao ◽  
David A. Turnshek ◽  
Gendith M. Sardane ◽  
Eric M. Monier
Keyword(s):  
Statistical Properties ◽  
Lyman Alpha ◽  
Neutral Gas ◽  
Damped Lyman Alpha Systems

Near-Infrared Integral Field Spectroscopy of Damped Lyman- $\alpha$ Systems

2006 ◽  
pp. 330-333
Author(s):  
Andrew Bunker ◽  
Annette Ferguson ◽  
Rachel Johnson ◽  
Richard McMahon ◽  
Ian Parry ◽  
...  
Keyword(s):  
Near Infrared ◽  
Lyman Alpha ◽  
Integral Field Spectroscopy ◽  
Field Spectroscopy ◽  
Damped Lyman Alpha Systems ◽  
Integral Field

A spectroscopic study of damped Lyman-alpha systems in the Las Campanas/Palomar survey

1993 ◽  
Vol 84 ◽  
pp. 1 ◽  
Author(s):  
Limin Lu ◽  
Arthur M. Wolfe ◽  
David A. Turnshek ◽  
Kenneth M. Lanzetta
Keyword(s):  
Spectroscopic Study ◽  
Lyman Alpha ◽  
Damped Lyman Alpha Systems

KINEMATIC PROPERTIES OF DAMPED LYMAN ALPHA SYSTEMS

2006 ◽  
Vol 15 (03) ◽  
pp. 371-386
Author(s):  
SNIGDHA DAS ◽  
PUSHPA KHARE
Keyword(s):  
Statistical Tests ◽  
Random Motion ◽  
Model Parameters ◽  
Galactic Halos ◽  
Dark Matter Halos ◽  
Lyman Alpha ◽  
The Press ◽  
Damped Lyman Alpha Systems ◽  
The Universe ◽  
Kinematic Properties

In a previous paper, we determined the statistical distributions for various classes of QSO absorption systems in the framework of the CDM model of the universe with a mass distribution of dark matter halos as given by the Press Schechter mechanism. These were shown to be consistent with the observed distributions for reasonable choices of model parameters. In this paper, we generate Voigt profiles of C IV lines associated with Damped Lyman Alpha systems in the framework of this model, taking into account rotation of disks and random motion of clouds embedded in galactic halos. We compare these with the profiles for a sample of 32 Damped Lyman Alpha systems collected from the literature by performing several statistical tests. These tests compare the width and the degree of asymmetry in the line profiles produced by the rotation of randomly inclined disks and the random velocity of clouds in the galactic halos, with the corresponding quantities in the observed profiles. We find that the kinematic properties predicted by the model are in good agreement with observations provided the disk thickness is about ten thousand times smaller than its radius, which indicates that the material in the disks is concentrated in dense clouds with roughly unit covering factor.

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