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Physical Properties of Dlas: Metallicity and Neutral Hydrogen Column Density

Published online by Cambridge University Press:  26 May 2016

J. L. Hou ,
C. G. Shu ,
W. P. Chen ,
R. X. Chang  and
C. Q. Fu
J. L. Hou
Affiliation:
Shanghai Astronomical Observatory, CAS, Shanghai, China
C. G. Shu
Affiliation:
Shanghai Astronomical Observatory, CAS, Shanghai, China Graduate Institute of Astronomy, National Central University, Taiwan, China
W. P. Chen
Affiliation:
Graduate Institute of Astronomy, National Central University, Taiwan, China
R. X. Chang
Affiliation:
Shanghai Astronomical Observatory, CAS, Shanghai, China
C. Q. Fu
Affiliation:
Shanghai Astronomical Observatory, CAS, Shanghai, China

Abstract

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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.

Type
Part 2. Origin
Information
Symposium - International Astronomical Union , Volume 217: Recycling Intergalactic and Interslettar Matter , 2004 , pp. 246 - 251
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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