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We present the spatial distributions of dust and polycyclic aromatichydrocarbons (PAHs) in the elliptical galaxy NGC4125, revealed by AKARI andSpitzer. NGC4125 is relatively bright in the dust and the PAH emision forelliptical galaxies, although it certainly possesses diffuse interstellar hotplasma indicated by the high spatial resolution X-ray data of Chandra. Weinvestigate how the dust and PAHs interact with the X-ray plasma or avoid theinteraction by comparing their spatial distributions. We find that thedistributions of the PAHs and dust are different from each other, both showinga significant deviation from a smooth stellar distribution. The PAH emissionpredominantly comes from a dust lane, a compact dense molecular gas region inthe galactic center, where the PAHs are likely to have been protected from theinteraction with the X-ray plasma. The dust emission has more extendedstructures similar to the distribution of the X-ray plasma, suggesting theirinteraction to some extent. We also discuss a possible origin of the dust andPAHs in the galaxy.

Properties of dust and PAHs in the hot plasma of the elliptical galaxy NGC4125 revealed with AKARI and Spitzer