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AA1730026036.pdf548.31 kB
titleProbing the Innermost Part of AGN Tori with the Near-Infrared CO Absorption Band
Author(jpn)馬場, 俊介; 中川, 貴雄; 磯部, 直樹; 白旗, 麻衣
Author(eng)Baba, Shunsuke; Nakagawa, Takao; Isobe, Naoki; Shirahata, Mai
Author Affiliation(jpn)宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS) : 東京大学; 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS); 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS); 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)
Author Affiliation(eng)Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS) : The University of Tokyo; Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS); Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS); Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)
Issue Date2018-03-09
PublisherJapan Aerospace Exploration Agency (JAXA)
宇宙航空研究開発機構(JAXA)
Publication titleJAXA Special Publication: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life
宇宙航空研究開発機構特別資料
VolumeJAXA-SP-17-009E
Start page217
End page220
Publication date2018-03-09
Languageeng
AbstractWe analyzed the 4.67 micrometers CO ro-vibrational absorption band in nearby ten active galactic nuclei (AGNs) observed with AKARI and Spitzer by fitting a plane-parallel local thermal equilibrium gas model. We found that the CO gas is warm (200-500 K) with a large column density (N(sub H) less than in the order of 10(exp 23) cm-2). Such a large column of warm gas is not achievable with UV heating or shock heating in starbursts. The most convincing heating source is X-ray photons emitted from the nuclei, which can produce warm gas of N(sub H) in the order of 10(exp 24) cm-2. This indicates that the region probed by the CO absorption is in the vicinity of the nuclei. The hydrogen column density estimated from the CO band is smaller than that inferred from X-ray observations. The observed deep absorption implies that the gas is close to the continuum source. We suggest that the probed region is outside the X-ray emitting region and just in front of the dust sublimation layer, which can be designated as the inner rim of the obscuring material around the AGNs.
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
Keywordsgalaxies: active; galaxies: nuclei; infrared: galaxies
Document TypeConference Paper
JAXA Category特別資料
NASA Subject CategoryAstronomy
ISSN(online)2433-2232
SHI-NOAA1730026036
Report NoJAXA-SP-17-009E
URIhttps://repository.exst.jaxa.jp/dspace/handle/a-is/879202


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