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Dwarf spheroidal galaxies are among the most numerous galaxy population inthe Universe, but their main formation and evolution channels are still notwell understood. The three dwarf spheroidal satellites (NGC147, NGC185, andNGC205) of the Andromeda galaxy are characterised by very differentinterstellar medium (ISM) properties, which might suggest them being atdifferent galaxy evolutionary stages. While the dust content of NGC205 has beenstudied in detail by De Looze et al. (2012), we present new Herschel dustcontinuum observations of NGC147 and NGC185. The non-detection of NGC147 inHerschel SPIRE maps puts a strong constraint on its dust mass (< 128 Msun). ForNGC185, we derive a total dust mass M_d = 5.1 x 10^3 Msun, which is a factor of~2-3 higher than that derived from ISO and Spitzer observations and confirmsthe need for longer wavelength observations to trace more massive cold dustreservoirs. We, furthermore, estimate the dust production by asymptotic giantbranch (AGB) stars and supernovae (SNe). For NGC147, the upper limit on thedust mass is consistent with expectations of the material injected by theevolved stellar population. In NGC185 and NGC205, the observed dust content isone order of magnitude higher compared to the estimated dust production by AGBsand SNe. Efficient grain growth, and potentially longer dust survival times(3-6 Gyr) are required to account for their current dust content. Our studyconfirms the importance of grain growth in the gas phase to account for thecurrent dust reservoir in galaxies.

The interstellar medium in Andromeda's dwarf spheroidal galaxies: I. Content and origin of the interstellar dust