A simple analytical model for the abundance of damped Ly-αabsorbers

Details A simple analytical model for the abundance of damped Ly-αabsorbers A simple analytical model for the abundance of damped Ly-αabsorbers

2001-10-16

arxiv.org/abs/astro-ph/0110359v2

Astrophys.J. 574 (2002) 59

Astronomy and Astrophysics

Astrophysics

Revised version; Accepted for publication in ApJ

Scientific paper

10.1086/340927

A simple analytical model for estimating the fraction (\Omega_{gas}) of matter in gaseous form within the collapsed dark matter (DM) haloes is presented. The model is developed using (i) the Press-Schechter formalism to estimate the fraction of baryons in DM haloes, and (ii) the observational estimates of the star formation rate at different redshifts. The prediction for \Omega_{gas} from the model is in broad agreement with the observed abundance of the damped Ly-\alpha systems. Furthermore, it can be used for estimating the circular velocities of the collapsed haloes at different redshifts, which could be compared with future observations.

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