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AA1730026016.pdf887.46 kB
titleProcessing of hydrocarbon dust in star-forming galaxies revealed with AKARI
Author(jpn)近藤, 晶乃; 金田, 英宏; 深川, 美里; 鈴木, 仁研; 村田, 勝寛; 國生, 拓摩; 大薮, 進喜
Author(eng)Kondo, Akino; Kaneda, Hidehiro; Fukagawa, Misato; Suzuki, Toyoaki; Murata, Katsuhiro L.; Kokusho, Takuma; Oyabu, Shinki
Author Affiliation(jpn)名古屋大学; 名古屋大学; 名古屋大学; 名古屋大学; 東京工業大学; 名古屋大学; 名古屋大学
Author Affiliation(eng)Nagoya University; Nagoya University; Nagoya University; Nagoya University; Tokyo Institute of Technology; Nagoya University; Nagoya University
Issue Date2018-03-09
PublisherJapan Aerospace Exploration Agency (JAXA)
Publication titleJAXA Special Publication: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life
Start page115
End page118
Publication date2018-03-09
AbstractHydrocarbon dust is one of the dominant components of interstellar dust, which mainly consists of polycyclic aromatic hydrocarbons and aliphatic hydrocarbons. While hydrocarbon dust is thought to be processed in interstellar radiation fields or shocks, detailed processing mechanisms are not completely understood yet. Therefore, we study the infrared spectral properties of hydrocarbon dust for 138 pure star-forming galaxies at redshift z less than 0.3. Using near-infrared spectra (2.5-5 micrometers) obtained with AKARI/IRC, we derived the luminosities of the aromatic hydrocarbon feature at 3.3 micrometers(L(sub aromatic)) and the aliphatic hydrocarbon feature at 3.4-3.6 micrometers (L(sub aliphatic)). We also derived the total infrared luminosity (L(sub IR)), the total PAH luminosity (L(sub PAH)) and the radiation field strength by modeling the spectral energy distributions of the sample galaxies with AKARI, IRAS, and WISE photometry data. We find that L(sub aliphatic)/L(sub IR) decreases with L(sub IR), like L(sub PAH)/L(sub IR) shown in previous studies. Moreover, we find that L(sub aliphatic)/L(sub aromatic) decreases with L(sub IR), indicating that aliphatic hydrocarbons are more highly processed than aromatic hydrocarbons. In this paper, we discuss possible processing mechanisms of interstellar hydrocarbon dust in galaxies with higher L(sub IR).
DescriptionMeeting Information: The 4th AKARI International Conference: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life (October 17-20, 2017. The University of Tokyo), Bunkyo-ku, Tokyo, Japan
Physical characteristics: Original contains color illustrations
会議情報: 第4回「あかり」国際会議 (2017年10月17-20日. 東京大学), 文京区, 東京
形態: カラー図版あり
Keywordsinfrared: ISM; galaxies: star formation; ISM: dust
Document TypeConference Paper
JAXA Category特別資料
NASA Subject CategoryAstronomy
Report NoJAXA-SP-17-009E

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