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Using the 3.5-m Herschel Space Observatory, imaging photometry of Cas A hasbeen obtained in six bands between 70 um and 500 um with the PACS and SPIREinstruments, with angular resolutions ranging from 6 to 37". In the outerregions of the remnant the 70-um PACS image resembles the 24-um image Spitzerimage, with the emission attributed to the same warm dust component, located inthe reverse shock region. At longer wavelengths, the three SPIRE bands areincreasingly dominated by emission from cold interstellar dust knots andfilaments, particularly across the central, western and southern parts of theremnant. Nonthermal emission from the northern part of the remnant becomesprominent at 500 um. We have estimated and subtracted the contributions fromthe nonthermal, warm dust and cold interstellar dust components. We confirm andresolve for the first time a cool (~35 K) dust component, emitting at 70-160um, that is located interior to the reverse shock region, with an estimatedmass of 0.075 Msun.

A Herschel PACS and SPIRE study of the dust content of the Cassiopeia A supernova remnant