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Hensley, Daniel Lenz, Olivier Dor\\'e","submitted_at":"2017-05-31T18:00:01Z","abstract_excerpt":"We present a new map of interstellar reddening, covering the 39\\% of the sky with low {\\rm HI} column densities ($N_{\\rm HI} < 4\\times10^{20}\\,\\rm cm^{-2}$ or $E(B-V)\\approx 45\\rm\\, mmag$) at $16\\overset{'}{.}1$ resolution, based on all-sky observations of Galactic HI emission by the HI4PI Survey. In this low column density regime, we derive a characteristic value of $N_{\\rm HI}/E(B-V) = 8.8\\times10^{21}\\, \\rm\\, cm^{2}\\, mag^{-1}$ for gas with $|v_{\\rm LSR}| < 90\\,\\rm km\\, s^{-1}$ and find no significant reddening associated with gas at higher velocities. 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