Imara, NiaLoeb, Abraham2017-05-312016Imara, N., and A. Loeb. 2016. “Limits on Intergalactic Dust During Reionization.” The Astrophysical Journal 816 (1) (January 1): L16. doi:10.3847/2041-8205/816/1/l16.2041-8213http://nrs.harvard.edu/urn-3:HUL.InstRepos:32750931In this Letter, we constrain the dust-to-gas ratio in the intergalactic medium (IGM) at high redshifts. We employ models for dust in the local Universe to contrain the dust-to-gas ratio during the epoch of reionization at redshifts z ~ 6-10. The observed level of reddening of high redshift galaxies implies that the IGM was enriched to an intergalactic dust-to-gas ratio of less than 3% of the Milky Way value by a redshift of z=10.en-USintergalactic mediumgalaxies: high-redshiftdustextinctioncosmology: dark ages, reionization, first starsJournal Article2017-02-1420152017-05-3110.3847/2041-8205/816/1/l16