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2010MNRAS.402.1523P - Mon. Not. R. Astron. Soc., 402, 1523-1535 (2010/March-1)
The nature of HI absorbers in gamma-ray burst afterglows: clues from hydrodynamic simulations.
PONTZEN A., DEASON A., GOVERNATO F., PETTINI M., WADSLEY J., QUINN T., BROOKS A., BELLOVARY J. and FYNBO J.P.U.
Abstract (from CDS):
We find that median impact parameters (measured from the potential minimum) are approximately 1kpc for GRBs compared with 4kpc for quasi-stellar object-DLA (QSO-DLA). However, an equally important difference is that GRB-DLAs are predominantly associated with haloes of mass 1010 < Mvir/M☉< 1012, an order of magnitude larger than the hosts of QSO-DLAs. Accordingly, there are differences in the stellar properties of hosts. For instance, mean star formation rates are higher: for GRB-DLAs compared with for QSO-DLAs.
Our simulations accurately predict the form of the GRB-DLA Hi column density distribution, producing quantitative agreement for NHi> 1019/cm2, but they somewhat underpredict the incidence of low column densities NHi< 1019/cm2. This is reflected in our estimate of the ionizing photon escape fraction, fesc≃ 1 per cent, which is lower than the observational GRB-derived escape fraction (2 per cent). Line-of-sight neutral gas metallicities predicted by our simulations (10–2 < Z/Z☉< 1) are consistent with the modest observational constraints. Because of large internal dispersions in gas metallicities, this agreement is not significantly compromised by imposing a cut-off on the metallicity of stars able to launch GRBs (Z* < Z☉/3), confounding claims that the observed metallicity of GRB-DLAs poses a severe challenge to current GRB models.
Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS
Journal keyword(s): galaxies: formation - quasars: absorption lines - gamma-rays: bursts
Simbad objects: 1
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