Title: A new, large-scale map of interstellar reddening derived from HI emission,
Abstract: 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. We compare our HI-based reddening map with the Schlegel,
Finkbeiner, and Davis (1998, SFD) reddening map and find them consistent to
within a scatter of $\simeq 5\,\rm mmag$. Further, the differences between our
map and the SFD map are in excellent agreement with the low resolution
($4\overset{\circ}{.}5$) corrections to the SFD map derived by Peek and Graves
(2010) based on observed reddening toward passive galaxies. We therefore argue
that our HI-based map provides the most accurate interstellar reddening
estimates in the low column density regime to date. Our reddening map is made
publicly available (this http URL).