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The Minimum Universal Metal Density Between Redshifts of 1.5 and 5.5

ASTROPHYSICAL JOURNAL, no. 2 (2001): L153-L156

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It appears that the Ly forest is becoming thick at a redshift of about 5.5, cutting off the higher redshift intergalactic medium from view in neutral hydrogen. However, the effects of star formation at higher redshift are still readable in the intergalactic metal lines. In this Letter, I use observations of 32 quasars with emission redshi...更多

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