TL;DR
This paper develops a method to recover large-scale dust emission in Herschel maps of Local Group galaxies by combining Herschel data with all-sky survey data, revealing significant previously missed emission and improving flux accuracy.
Contribution
The authors introduce a Fourier space combination technique to restore extended emission in Herschel maps, addressing a key limitation in previous data reduction methods.
Findings
Recovered over 20% of missing emission in some bands.
Resolved flux discrepancies between Herschel and other telescopes.
Detected dust emission at lower densities than previously possible.
Abstract
Because the galaxies of the Local Group have such large angular sizes, much of their diffuse, large-angular-scale emission is filtered out by the Herschel data reduction process. In this work, we restore this previously missed dust in Herschel observations of the Large Magellanic Cloud, Small Magellanic Cloud, M31, and M33. We do this by combining Herschel data (including new reductions for the Magellanic Clouds), in Fourier space, with lower-resolution data from all-sky surveys (Planck, IRAS, and COBE) that did not miss the extended emission. With these new maps, we find that a significant amount of emission was missing from uncorrected Herschel data of these galaxies; over 20% in some bands. Our new photometry also resolves the disagreement between fluxes reported from older HERITAGE Magellanic Cloud Herschel reductions, and fluxes reported from other telescopes. More emission is…
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