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M82 is a unique representative of a whole class of galaxies, starbursts withsuperwinds, in the Very Nearby Galaxy Survey with Herschel. In addition, itsinteraction with the M81 group has stripped a significant portion of itsinterstellar medium from its disk. SPIRE maps now afford bettercharacterization of the far-infrared emission from cool dust outside the disk,and sketch a far more complete picture of its mass distribution and energeticsthan previously possible. They show emission coincident in projection with thestarburst wind and in a large halo, much more extended than the PAH bandemission seen with Spitzer. Some complex substructures coincide with thebrightest PAH filaments, and others with tidal streams seen in atomic hydrogen.We subtract the far-infrared emission of the starburst and underlying disk fromthe maps, and derive spatially-resolved far-infrared colors for the wind andhalo. We interpret the results in terms of dust mass, dust temperature, andglobal physical conditions. In particular, we examine variations in the dustphysical properties as a function of distance from the center and the windpolar axis, and conclude that more than two thirds of the extraplanar dust hasbeen removed by tidal interaction, and not entrained by the starburst wind.

SPIRE imaging of M82: cool dust in the wind and tidal streams