Damped Lyman-alpha systems and galaxy formation

1994 ◽  
Vol 430 ◽  
pp. L25 ◽  
Author(s):  
H. J. Mo ◽  
J. Miralda-Escude
Keyword(s):  
Galaxy Formation ◽  
Lyman Alpha ◽  
Damped Lyman Alpha Systems

scholarly journals Damped Lyman alpha systems and galaxy formation models - II. High ions and Lyman-limit systems

2003 ◽  
Vol 343 (1) ◽  
pp. 268-278 ◽  
Author(s):  
A. H. Maller ◽  
J. X. Prochaska ◽  
R. S. Somerville ◽  
J. R. Primack
Keyword(s):  
Galaxy Formation ◽  
Lyman Alpha ◽  
Damped Lyman Alpha Systems

scholarly journals Physical Properties of Dlas: Metallicity and Neutral Hydrogen Column Density

2004 ◽  
Vol 217 ◽  
pp. 246-251
Author(s):  
J. L. Hou ◽  
C. G. Shu ◽  
W. P. Chen ◽  
R. X. Chang ◽  
C. Q. Fu
Keyword(s):  
Star Formation ◽  
Galaxy Formation ◽  
Column Density ◽  
High Redshift ◽  
Formation Rate ◽  
Neutral Hydrogen ◽  
Gas Content ◽  
Lyman Alpha ◽  
Formation Mode ◽  
Damped Lyman Alpha Systems

We investigate some basic properties of Damped Lyman alpha systems based on the Semi-Analytical model of disk galaxy formation theory. We derive the DLA metallicity, column density, number density, gas content and cosmic star formation rate by assuming that disks form at the center of dark halos, and the modelled DLAs are selected by Monte Carlo simulation according to the distributions of halo properties. We find that DLA hosts are dominated by small galaxies and biased to extended galaxies. In terms of model results, DLAs could naturally arise in a ACDM universe from radiatively cooled gas in dark matter halos. However, model predicts a reverse correlation between metallicity and the column density when compared with observations, regardless of the proposed observational bias. We argue that this could be resulted from the model limitations, or the inadequacy of Schmidt-type star formation mode at high redshift, or/and the diversities of DLA populations.

scholarly journals Damped Lyman alpha systems and galaxy formation models - I. The radial distribution of cold gas at highz

2001 ◽  
Vol 326 (4) ◽  
pp. 1475-1488 ◽  
Author(s):  
Ariyeh H. Maller ◽  
Jason X. Prochaska ◽  
Rachel S. Somerville ◽  
Joel R. Primack
Keyword(s):  
Galaxy Formation ◽  
Radial Distribution ◽  
Lyman Alpha ◽  
Damped Lyman Alpha Systems ◽  
Cold Gas

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

Redshift Evolution of Damped Lyman Alpha Absorbers and the Epoch of Galaxy Formation

1993 ◽  
Vol 688 (1) ◽  
pp. 545-550
Author(s):  
ANNE L. KINNEY ◽  
RICHARD L. WHITE ◽  
ROBERT H. BECKER
Keyword(s):  
Galaxy Formation ◽  
Lyman Alpha

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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