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Spitzer and AKARI observations have found that polycyclic aromatichydrocarbons (PAHs) are present in nearby elliptical galaxies, but theirspatial distributions are still unknown. In order to investigate theirdistributions, we performed deep spectral mapping observations of thePAH-detected elliptical galaxy NGC4589, a merger remnant with a minor-axisoptical dust lane. As a result, we obtain clear evidence that the PAH 11.3 umemission comes predominantly from the dust lane of the galaxy. We also detectmolecular hydrogen line emissions from the dust lane. The PAH 17 um emission isdistributed differently from the PAH 11.3 um emission, and more similarly tothe dust continuum emission. From their distinctive distributions, we suggestthat the PAHs responsible for the 11.3 um feature are secondary productsthrough the evolution of the ISM brought in by the merger.

PAH emission from the dust lane of an elliptical galaxy with the Spitzer IRS