AKARI near-infrared spectroscopy of 3 micron PAH and 4 micron PAD features

T. Onaka, I. Sakon, R. Ohsawa, T. Shimonishi, Y. Okada, M. Tanaka, H. Kaneda

研究成果: Conference contribution

3 被引用数 (Scopus)

抄録

Near-infrared (NIR; 2.5-5 μm) low-resolution (λ/Δλ ~ 100) spectra were obtained for a number of Galactic and extragalactic objects with the Infrared Camera (IRC) in the AKARI warm mission. These data provide us with the first opportunity to make a systematic study of the 3.3-3.5 μm PAH features in a galactic scale as well as within an object. Whereas the 3.3 μm band is well resolved in most spectra, the 3.5 μm band is not clearly separated from the 3.4 μm band in the IRC spectrum. The intensity ratio of the summation of the 3.4 and 3.5 μm bands to the 3.3 μm band shows a tendency to increase towards the Galactic center, although a large variation in the ratio is also seen in a local scale. A search for deuterated PAH features in the 4 μm region is carried out in IRC NIR spectra. Emission lines originating from the ionized gas together with the detector anomaly hamper an accurate search at certain wavelengths, but little convincing evidence has so far been obtained for the presence of significant features in 4.2-4.7 μm. A conservative upper limit of a few percents is obtained for the integrated intensity ratio of the 4.4-4.7 μm possible features to the 3.3-3.5 μm PAH features in the spectra so far obtained.

本文言語English
ホスト出版物のタイトルPAHs and the Universe
ホスト出版物のサブタイトルA Symposium to Celebrate the 25th Anniversary of the PAH Hypothesis
ページ55-60
ページ数6
DOI
出版ステータスPublished - 2011
イベントPAHs and the Universe: A Symposium to Celebrate the 25th Anniversary of the PAH Hypothesis - Toulouse, France
継続期間: 2010 5 312010 6 4

出版物シリーズ

名前EAS Publications Series
46
ISSN(印刷版)1633-4760
ISSN(電子版)1638-1963

Other

OtherPAHs and the Universe: A Symposium to Celebrate the 25th Anniversary of the PAH Hypothesis
国/地域France
CityToulouse
Period10/5/3110/6/4

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 工学(全般)
  • 宇宙惑星科学

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