@inproceedings{oai:jaxa.repo.nii.ac.jp:00003133,
 author = {岡部, 愛 and 金田, 英宏 and 山岸, 光義 and 鈴木, 仁研 and 鵜飼, 壮太 and Okabe, Megumi and Kaneda, Hidehiro and Yamagishi, Mitsuyoshi and Suzuki, Toyoaki and Ukai, Sota},
 book = {宇宙航空研究開発機構特別資料, JAXA Special Publication: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life},
 month = {Mar},
 note = {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, 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, Dust in the haloes of galaxies plays a vital role in understanding the circulation of matters on galactic scales. Despite the importance, it is difficult to detect the dust emission from the galactic haloes, even if present, due to the lack of efficient heating sources in the haloes. Here, we propose a new approach to study dust in the haloes of nearby galaxies by observing the 9.7-micrometers silicate absorption feature with the AKARI/IRC-S7 (7 micrometers) and S11 (11 micrometers) bands. We analyzed the data of the 5 nearby galaxies with moderately large inclination angles, NGC 2403, NGC 1313, NGC 6496, NGC 6951 and M 51. As a result, all the sample galaxies show the gradients of I(7)/I(11) toward the expected directions with respect to the disks. From the I(7)/I(11) maps, we estimate the masses of dust in the haloes, assuming that the dust-extinction-corrected I(7)/I(11) ratios do not have large-scale gradients over the disks of the galaxies. The result suggests that a surprisingly large amount of dust may exist in the haloes of galaxies., 形態: カラー図版あり, Physical characteristics: Original contains color illustrations, 資料番号: AA1730026059, レポート番号: JAXA-SP-17-009E},
 pages = {309--312},
 publisher = {宇宙航空研究開発機構(JAXA), Japan Aerospace Exploration Agency (JAXA)},
 title = {A new approach to study dust in the haloes of nearby galaxies using mid-infrared extinction in the AKARI/IRC 7 and 11 micrometers bands},
 volume = {JAXA-SP-17-009E},
 year = {2018}
}