Seminars & Lectures
| * TITLE | Distribution of HI inside galaxies at High Redshift | ||||||
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| * DATE / TIME | 2012-02-21, 4:00 pm | ||||||
| * PLACE | 503 Conference room | ||||||
| * ABSTRACT | |||||||
| We model the large-scale distribution of neutral hydrogen (HI) in the post- reionization universe in a hierarchical model of galaxy formation. The model is implemented in the form of semi-analytic prescriptions describing various physical processes on top of gravity only N-body simulations. Merger trees of dark matter haloes are obtained from the simulations and baryonic physics is then implemented in each branch of the merger tree. The model is calibrated with observations of the Tully-Fisher relation, and of the Milky Way, at z = 0. We find that our prediction for the HI density parameter (Omega_HI) is in good agreement with observations in the local universe. We predict a peak value of Omega_HI ~ 10^3 at around z ~ 5. The small-scale bias is higher in our model than in previous work. The enhanced HI power spectrum predicts better prospects for a detection using instruments like the GMRT, SKA and MWA. We compare our findings with previous work in which HI was assigned to dark matter haloes using simple prescriptions. |
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