Near- to mid-infrared spectroscopy for the giant elliptical galaxy NGC 1316 (FORNAX A) with the AKARI infrared camera

被引:18
|
作者
Kaneda, H.
Onaka, T.
Sakon, I.
机构
[1] Japan Aerospace Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Kanagawa 2298510, Japan
[2] Univ Tokyo, Grad Sch Sci, Dept Astron, Bunkyo Ku, Tokyo 1130003, Japan
来源
ASTROPHYSICAL JOURNAL | 2007年 / 666卷 / 01期
关键词
galaxies : elliptical and lenticular; cD; galaxies : ISM; infrared : ISM; ISM : lines and bands; ISM : molecules;
D O I
10.1086/521527
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present the near- to mid-infrared (similar to 2.5-13 mu m) spectrum of the giant elliptical galaxy NGC 1316 ( Fornax A) obtained with the Infrared Camera (IRC) on board AKARI. NGC 1316 is known to have a peculiar polycyclic aromatic hydrocarbon (PAH) emission spectrum with an unusually high ratio of the 11.3 mu m to the 7.7 mu m emission intensity through the Spitzer IRS observation. NGC 1316 is a 3 Gyr old merger remnant with a dormant nucleus that was rather active 0.1 Gyr ago; the relatively well-known evolutionary history makes the elliptical galaxy an ideal probe for studying long-term effects of past energetic events on the interstellar medium. We have found that there is no significant PAH emission feature at 3.3 mu m while we have confirmed the peculiar PAH emission spectrum in the mid-infrared. We have detected a strong absorption feature at 4.3 mu m, which may be attributed to solid-state CO2 in grain mantles. We discuss physical implications for those unusual emission and absorption features.
引用
收藏
页码:L21 / L24
页数:4
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