AKARI near-infrared spectroscopic observations of interstellar ices in the edge-on starburst galaxy NGC 253

Mitsuyoshi Yamagishi, Hidehiro Kaneda, Daisuke Ishihara, Shinki Oyabu, Takashi Onaka, Takashi Shimonishi, Toyoaki Suzuki

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11 Citations (Scopus)

Abstract

We present the spatially resolved near-infrared (2.5-5.0 μm) spectra of the edge-on starburst galaxy NGC 253 obtained with the Infrared Camera on board AKARI. Near the center of the galaxy, we clearly detect the absorption features of interstellar ices (H2O: 3.05 μm, CO2: 4.27 μm, and XCN: 4.62 μm) and the emission of polycyclic aromatic hydrocarbons (PAHs) at 3.29 μm and the hydrogen recombination line Brα at 4.05 μm. We find that the distributions of the ices differ from those of the PAH and gas. We calculate the column densities of the ices and derive the abundance ratios of N(CO2)/N(H2O) = 0.17 ± 0.05. They are similar to those obtained around the massive young stellar objects in our Galaxy (0.17 ± 0.03), although a much stronger interstellar radiation field and higher dust temperature are expected near the center of NGC 253.

Original languageEnglish
Article numberL20
JournalAstrophysical Journal Letters
Volume731
Issue number1 PART II
DOIs
Publication statusPublished - 2011 Apr 10

Keywords

  • ISM: abundances
  • ISM: molecules
  • galaxies: ISM
  • galaxies: individual (NGC 253)
  • infrared: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Yamagishi, M., Kaneda, H., Ishihara, D., Oyabu, S., Onaka, T., Shimonishi, T., & Suzuki, T. (2011). AKARI near-infrared spectroscopic observations of interstellar ices in the edge-on starburst galaxy NGC 253. Astrophysical Journal Letters, 731(1 PART II), [L20]. https://doi.org/10.1088/2041-8205/731/1/L20