Papers › A new, large-scale map of interstellar reddening derived from HI emission
A new, large-scale map of interstellar reddening derived from HI emission
Daniel Lenz, Brandon S. Hensley, Olivier Doré
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We present a new map of interstellar reddening, covering the 39\% of the sky with low {\rm HI} column densities (N_(HI) < 4×10²⁰ cm⁻² or E(B-V)≈45 mmag) at 16′.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_(HI)/E(B-V) = 8.8×10²¹ cm² mag⁻¹ for gas with |v_(LSR)| < 90 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 ≃5 mmag. Further, the differences between our map and the SFD map are in excellent agreement with the low resolution (4∘.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).
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