Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-10-15
Astronomy and Astrophysics
Astrophysics
6 pages, 6 figures, to appear in `Recycling Intergalactic and Interstellar Matter', IAU Symp. Ser., vol. 217, eds. P.-A. Duc,
Scientific paper
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 $\Lambda$CDM 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.
Chang Rui-Xiang
Chen Wang-Ping
Fu Cheng-Qi
Hou Lu-Jing
Shu Cheng-Gang
No associations
LandOfFree
Physical properties of DLA metallicity and neutral hydrogen column density does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Physical properties of DLA metallicity and neutral hydrogen column density, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Physical properties of DLA metallicity and neutral hydrogen column density will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-526973