Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004arep...48....9d&link_type=abstract
Astronomy Reports, vol. 48, Issue 1, p.9-20
Astronomy and Astrophysics
Astronomy
2
Scientific paper
The mixing of metals in the intergalactic gas when a galaxy with a metal-rich envelope moves through the intergalactic medium is analyzed. Two simple models for the initial distribution of metals are considered. In the first case, the metals are concentrated in a fairly thin envelope with thickness ΔR s =1 kpc, outer radius R s =31 kpc, and metallicity Z=10-3. In the second case, material with the same metallicity uniformly fills an entire spherical region of radius R s . After 2.85 Gyr, the metals are distributed over a fairly extended volume with a typical size of ⋍200 kpc in the direction of the motion of the intergalactic gas, with a mean metallicity of ⋍4.6×10-4 in metal-enriched regions. However, the distribution of metals remains extremely nonuniform, so that the main contribution to the overall metallicity is provided by metal-rich islands Z≳6×10-4 that occupy only ˜10% of the total mixing volume. Moreover, metal-free regions remain in this volume.
Dedikov Yu. S.
Shchekinov Yu A.
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