The Chemical Evolution of the Universe Silicon, at Substantial Red Shifts

Details The Chemical Evolution of the Universe Silicon, at Substantial Red Shifts The Chemical Evolution of the Universe Silicon, at Substantial Red Shifts

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..204..323s&link_type=abstract

The Extragalactic Infrared Background and its Cosmological Implications, Proceedings of IAU Symposium #204, held 15-18 August 20

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The discovery of widely distributed metals in the high reshift Lyman alpha forest has allowed us to probe the metallicity of the bulk of the baryons at these redshifts and hence to infer information about the very earliest star formation which is believed to have produced this contamination. There is widespread agreement among observers and modellers that the higher column density clouds with N(H1)>3e14 cm-2 have a C/H metallicity in the range -3 to -2.5, with Si/H being about 2 to 3 times higher. The absolute metal density in the diffuse IGM has been estimated at Omega{metals} = 3.3e-7 at z=3 for H=65 and q=0. A remaining fundamental question is how uniformly the IGM was polluted, and, in particular, if metal contamination extends to the low density voids in the intergalactic medium which produce the lowest column density Lyman alpha forest clouds. Such pollution would require very efficient metal release from the early galaxies. I will argue that CIV/HI remains roughly constant down to N(H1)=7e13cm-2 well into the void regions. I will also discuss the evolution of the metal content of the forest from z=5 to z=2.

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