Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-01-10
Mon.Not.Roy.Astron.Soc. 358 (2005) 379-396
Astronomy and Astrophysics
Astrophysics
20 pages, 12 figures, MNRAS accepted
Scientific paper
10.1111/j.1365-2966.2005.08762.x
We study the motion of dust grains into the Intergalactic Medium (IGM) around redshift z=3, to test the hypothesis that grains can efficiently pollute the gas with metals through sputtering. We use the results available in the literature for radiation-driven dust ejection from galaxies as initial conditions, and follow the motion onward. Via this mechanism, grains are ejected into the IGM with velocities >100 km/s; as they move supersonically, grains can be efficiently eroded by non-thermal sputtering. However, Coulomb and collisional drag forces effectively reduce the charged grain velocity. Up-to-date sputtering yields for graphite and silicate (olivine) grains have been derived using the code TRIM, for which we provide analytic fits. After training our method on a homogeneous density case, we analyze the grain motion and sputtering in the IGM density field as derived from a LambdaCDM cosmological simulation at z = 3.27. We found that only large (a >~ 0.1-um) grains can travel up to considerable distances (few times 100 kpc physical) before being stopped. Resulting metallicities show a well defined trend with overdensity delta. The maximum metallicities are reached for 10
Bianchi Simone
Ferrara Andrea
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