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With the Infrared Camera on board AKARI, we carried out near-infrared(2.5-5.0 micron) spectroscopy of the central kiloparsec region of the barredspiral galaxy, NGC1097, categorized as Seyfert 1 with a circumnuclear starburstring. Our observations mapped the area of ~50"*10" with the resolution of ~5",covering about a half of the ring and the galactic center. As a result, wespatially resolve the starburst ring in the polycyclic aromatic hydrocarbon 3.3micron, the aliphatic hydrocarbon 3.4-3.6 micron features, and the hydrogen Bralpha 4.05 micron emission. They exhibit spatial distributions significantlydifferent from each other, indicating that the environments vary considerablyaround the ring. In particular, the aliphatic features are enhanced near thebar connecting the ring with the nucleus, where the structure of hydrocarbongrains seems to be relatively disordered. Near the center, the continuumemission and the CO/SiO absorption features are strong, which indicates thatthe environments inside the ring are dominated by old stellar populations. Thenear-infrared spectra do not show any evidence for the presence of nuclearactivity.

The Central Region of the Barred Spiral Galaxy NGC1097 Probed by AKARI Near-Infrared Spectroscopy