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 ($N_{\mathrm{HI}}<4\times 10^{20}\mathrm{c}{\mathrm{m}}^{-2}$ or $E(B-V)\approx 45\mathrm{mmag}$) at $16\stackrel{{}^{\prime }}{.}1$ 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 $N_{\mathrm{HI}}/E(B-V)=8.8\times 10^{21}\mathrm{c}{\mathrm{m}}^2\mathrm{ma}{\mathrm{g}}^{-1}$ for gas with $|v_{\mathrm{LSR}}|<90\mathrm{km}{\mathrm{s}}^{-1}$ 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 $\simeq 5\mathrm{mmag}$. Further, the differences between our map and the SFD map are in excellent agreement with the low resolution ($4\stackrel{\circ }{.}5$) 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 (http://dx.doi.org/10.7910/DVN/AFJNWJ).

Re-submitted to ApJ. The reddening map is available at http://dx.doi.org/10.7910/DVN/AFJNWJ

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