{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/a-new-large-scale-map-of-interstellar","title":"A new, large-scale map of interstellar reddening derived from HI emission","arxiv_id":"1706.00011","date":"2017-05-31","proceeding":null,"authors":["Daniel Lenz","Brandon S. Hensley","Olivier Doré"],"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 (http://dx.doi.org/10.7910/DVN/AFJNWJ).","url_abs":"https://arxiv.org/abs/1706.00011v2","url_pdf":"https://arxiv.org/pdf/1706.00011v2.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"a-new-large-scale-map-of-interstellar","repo_url":"https://github.com/daniellenz/ebv_tools","is_official":0,"mentioned_in_paper":0,"mentioned_in_github":1,"framework":"none","reach":null},{"paper_slug":"a-new-large-scale-map-of-interstellar","repo_url":"https://github.com/jvines/astroARIADNE","is_official":0,"mentioned_in_paper":0,"mentioned_in_github":1,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"syntology_url":null,"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}