Fig. 4.

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Cross-correlations between the H I column density NH I and (top) the thermal dust amplitude and (bottom) the AME amplitude. The thermal dust cross-correlation is evaluated at HEALPix resolution Nside = 64 and a common angular resolution of 60′ FWHM, while the AME cross-correlation is evaluated at HEALPix resolution Nside = 16 and a common angular resolution of 10° FWHM. The lines represent best-fit lines for pixels with H I column densities less than 2 × 1020 cm−2 (blue) or 4 × 1020 cm−2 (orange). The green curve is the best-fit second degree polynomial to pixels with H I column densities less than 4 × 1020 cm−2. The contour lines are plotted at 0.001, 0.01, 0.05, and 0.1 ; where only the lower three contour line values are plotted for AME. The contours have been smoothed for visualization.

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