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Anomaly of Hydrogen Recombination Line Ratio in Ultraluminous Infrared Galaxies
https://jaxa.repo.nii.ac.jp/records/3151
https://jaxa.repo.nii.ac.jp/records/3151b69eddb2-745e-4acb-810f-144484daac2d
名前 / ファイル | ライセンス | アクション |
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AA1730026077.pdf (278.5 kB)
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Item type | 会議発表論文 / Conference Paper(1) | |||||
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公開日 | 2018-05-18 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Anomaly of Hydrogen Recombination Line Ratio in Ultraluminous Infrared Galaxies | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | active galaxies | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | star formation | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | infrared galaxies | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | recombination lines | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_5794 | |||||
資源タイプ | conference paper | |||||
著者 |
矢野, 健一
× 矢野, 健一× 中川, 貴雄× Malkan, Matthew× 磯部, 直樹× 白旗, 麻衣× 馬場, 俊介× 道井, 亮介× Bhalotia, Vanshree× Yano, Kenichi× Nakagawa, Takao× Malkan, Matthew× Isobe, Naoki× Shirahata, Mai× Baba, Shunsuke× Doi, Ryosuke× Bhalotia, Vanshree |
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著者所属 | ||||||
東京大学 : 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS) | ||||||
著者所属 | ||||||
宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS) | ||||||
著者所属 | ||||||
University of California, Los Angeles | ||||||
著者所属 | ||||||
宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS) | ||||||
著者所属 | ||||||
宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS) | ||||||
著者所属 | ||||||
東京大学 : 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS) | ||||||
著者所属 | ||||||
東京大学 : 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS) | ||||||
著者所属 | ||||||
DePaul University | ||||||
著者所属(英) | ||||||
en | ||||||
The University of Tokyo : Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS) | ||||||
著者所属(英) | ||||||
en | ||||||
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS) | ||||||
著者所属(英) | ||||||
en | ||||||
University of California, Los Angeles | ||||||
著者所属(英) | ||||||
en | ||||||
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS) | ||||||
著者所属(英) | ||||||
en | ||||||
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS) | ||||||
著者所属(英) | ||||||
en | ||||||
The University of Tokyo : Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS) | ||||||
著者所属(英) | ||||||
en | ||||||
The University of Tokyo : Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS) | ||||||
著者所属(英) | ||||||
en | ||||||
DePaul University | ||||||
出版者 | ||||||
出版者 | 宇宙航空研究開発機構(JAXA) | |||||
出版者(英) | ||||||
出版者 | Japan Aerospace Exploration Agency (JAXA) | |||||
書誌情報 |
宇宙航空研究開発機構特別資料 en : JAXA Special Publication: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life 巻 JAXA-SP-17-009E, p. 379-382, 発行日 2018-03-09 |
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会議概要(会議名, 開催地, 会期, 主催者等) | ||||||
内容記述タイプ | Other | |||||
内容記述 | 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 | |||||
会議概要(会議名, 開催地, 会期, 主催者等)(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | 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 | |||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | We made systematic observations of the HI Br alpha (4.05 micrometers) and Br beta (2.63 micrometers) lines in 52 nearby (z less than 0.3) ULIRGs with AKARI. Our observations show that ULIRGs have a tendency to indicate higher Br beta/Br alpha line ratios than those observed in Galactic HII regions, and three galaxies in the observed sample show the anomaly of the Br beta/Br alpha line ratios (in the order of 1.0), which are significantly higher than that of case B (0.565). The high Br beta/Br alpha line ratios cannot be explained by the combination of the dust extinction and the case B, since dust extinction reduces the ratio. We simulate HII regions in the ULIRGs with the Cloudy code, and show that the high Br beta/Br alpha line ratios can be explained with the combination of the optically thick Br alpha line and the optically thin Br beta line. To achieve the column density large enough to make the Br alpha line optically thick, the gas density is required as high as n in the order of 10(exp 8) cm(exp -3). Hence our results suggest that star-formation activity in ULIRGs occurs preferentially in high-density clouds. | |||||
内容記述 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 形態: カラー図版あり | |||||
内容記述(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Physical characteristics: Original contains color illustrations | |||||
ISSNONLINE | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 2433-2232 | |||||
資料番号 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 資料番号: AA1730026077 | |||||
レポート番号 | ||||||
内容記述タイプ | Other | |||||
内容記述 | レポート番号: JAXA-SP-17-009E |