Incidence Rate of GRB‐host‐DLAs
- Conference date: 23–27 June 2008
- Location: Nanjing (China)
We discuss our recent work  on the incidence rate of damped Lyα systems associated with the host galaxies of gamma‐ray bursts (GRB‐host‐DLAs) using cosmological SPH simulations. Assuming that the GRB occurrence is correlated with the local star formation rate (SFR), we find that the median of GRB‐host‐DLAs progressively shifts to lower values with increasing redshift, and the incidence rate of GRB‐host‐DLAs with log decreases rapidly at This increases the likelihood of observing the signature of IGM attenuation in GRB afterglows towards higher redshift, because it will not be blocked by the red damping wing of GRB‐host‐DLAs. This enhances the prospects of using high‐z GRBs to probe the reionization of the Universe. The overall incidence rate of GRB‐host‐DLAs decreases monotonically with increasing redshift, whereas that of QSO‐DLAs increases up to A measurement of the difference between the two incidence rates would enable an estimation of the value of which is the mass fraction of stars that become GRBs for a given amount of star formation. Our predictions can be tested by upcoming high‐z GRB missions, including JANUS and SVOM.
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