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The properties of the dust in the cold and hot gas phases of early-typegalaxies (ETGs) are key to understand ETG evolution. We thus conducted asystematic study of the dust in a large sample of local ETGs, focusing onrelations between the dust and the molecular, atomic, and X-ray gas of thegalaxies, as well as their environment. We estimated the dust temperatures andmasses of the 260 ETGs from the ATLAS3D survey, using fits to their spectralenergy distributions primarily constructed from AKARI measurements. We alsoused literature measurements of the cold (CO and HI) and X-ray gas phases. OurETGs show no correlation between their dust and stellar masses, suggestinginefficient dust production by stars and/or dust destruction in X-ray gas. Theglobal dust-to-gas mass ratios of ETGs are generally lower than those oflate-type galaxies, likely due to dust-poor HI envelopes in ETGs. They are alsohigher in Virgo Cluster ETGs than in group and field ETGs, but the same ratiosmeasured in the central parts of the galaxies only are independent of galaxyenvironment. Slow-rotating ETGs have systematically lower dust masses thanfast-rotating ETGs. The dust masses and X-ray luminosities are correlated infast-rotating ETGs, whose star formation rates are also correlated with theX-ray luminosities. The correlation between dust and X-rays in fast-rotatingETGs appears to be caused by residual star formation, while slow-rotating ETGsare likely well evolved, and thus exhausting their dust. These results appearconsistent with the postulated evolution of ETGs, whereby fast-rotating ETGsform by mergers of late-type galaxies and associated bulge growth, whileslow-rotating ETGs form by (dry) mergers of fast-rotating ETGs. Central colddense gas appears to be resilient against ram pressure stripping, suggestingthat Virgo Cluster ETGs may not suffer strong related star formationsuppression.

Dust properties in the cold and hot gas phases of the ATLAS3D early-type galaxies as revealed by AKARI