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The Korean Astronomical Society (한국천문학회)
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THE CENTRAL REGION OF THE BARRED SPIRAL GALAXY NGC 1097 PROBED BY AKARI NEAR-INFRARED SPECTROSCOPY

  • Kondo, T. (Graduate School of Science, Nagoya University) ;
  • Kaneda, H. (Graduate School of Science, Nagoya University) ;
  • Oyabu, S. (Graduate School of Science, Nagoya University) ;
  • Ishihara, D. (Graduate School of Science, Nagoya University) ;
  • Mori, T. (Graduate School of Science, Nagoya University) ;
  • Yamagishi, M. (Graduate School of Science, Nagoya University) ;
  • Onaka, T. (Graduate School of Science, The University of Tokyo) ;
  • Sakon, I. (Graduate School of Science, The University of Tokyo) ;
  • Suzuki, T. (Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency)
  • Received : 2012.06.30
  • Accepted : 2012.08.15
  • Published : 2012.09.16
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Abstract

With AKARI, we carried out near-infrared spectroscopy of the nearby barred spiral galaxy, NGC 1097, categorized as Seyfert 1 with a circumnuclear starburst ring. Our observations mapped the galactic center region. As a result, we obtain the spatial distributions of the polycyclic aromatic hydrocarbon $3.3{\mu}m$ and the aliphatic hydrocarbon $3.4-3.6{\mu}m$ emission. The former is detected from all the observed regions and the latter is enhanced near the bar connecting the ring with the nucleus. In addition, we detect absorption features due to $H_2O$ ice and CO/SiO at the ring and the galactic center, while we detect the hydrogen recombination line $Br{\alpha}$ only from the ring. Hence the observed spectra change dramatically within the central 1 kpc region.

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References

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