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We present a preliminary analysis of the H rschelPACS and SPIRE data around the galaxy NGC 4438. Combining theSpitzerandHerscheldata we obtain the full dust spectral energy distribution and explore the heating source and dust survival time in the h ot intergalactic medium close to the boundaries of the galaxy. We model the evolution of the dust s ize distribution and its emission due to collisions with gas ions and electrons and find that the predicted dust spectral energy distribution is consistent with the observations. We there fore conclude that dust in the hot X-ray emitting gas close to NGC 4438 ( T ∼ 5× 106 K, nH = 0.02 cm−3) undergoes both heating and destruction by hot electrons. This highlights the interact ion between the cool interstellar medium and the hot intergalactic medium that gives rise to an enhanc ement of the X-ray luminosity of the galaxy. However, the predicted dust lifetime is shorter tha n the dynamical timescale and so the hot gas seemingly entrain evaporating dense clumps of the in erstellar medium stripped from the galaxy.

Dust collisional heating and small grain destruction in NGC 4438