Incidence Rate of GRB-host-DLAs

Details Incidence Rate of GRB-host-DLAs Incidence Rate of GRB-host-DLAs

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1065..355n&link_type=abstract

2008 NANJING GAMMA-RAY BURST CONFERENCE. AIP Conference Proceedings, Volume 1065, pp. 355-360 (2008).

Mathematics

Logic

Gamma-Ray Sources, Gamma-Ray Bursts, Quasars, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies

Scientific paper

We discuss our recent work [1] 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 NHI of GRB-host-DLAs progressively shifts to lower NHI values with increasing redshift, and the incidence rate of GRB-host-DLAs with log NHI>21.0 decreases rapidly at z>=6. 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 z = 6. A measurement of the difference between the two incidence rates would enable an estimation of the value of ɛGRB 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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