FAR-INFRARED EMISSION FROM THE INTERGALACTIC MEDIUM IN STEPHAN'S QUINTET REVEALED BY AKARI

被引：4

作者：

Suzuki, Toyoaki ^{[1
]}

Kaneda, Hidehiro ^{[2
]}

Onaka, Takashi ^{[3
]}

Kitayama, Tetsu ^{[4
]}

机构：

[1] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Chuo Ku, Kanagawa 2525210, Japan

[2] Nagoya Univ, Grad Sch Sci, Chikusa Ku, Nagoya, Aichi 4648602, Japan

[3] Univ Tokyo, Grad Sch Sci, Dept Astron, Bunkyo Ku, Tokyo 1130033, Japan

[4] Toho Univ, Dept Phys, Chiba 2748510, Japan

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2011年 / 731卷 / 01期

关键词：

galaxies: clusters: individual (Stephan's Quintet); galaxies: interactions; infrared: ISM; ISM: structure; STAR-FORMATION; COMPACT-GROUPS; GALAXIES; DUST; COLLISION; ABUNDANCE; CLOUDS; SHOCKS; LINE; GAS;

D O I：

10.1088/2041-8205/731/1/L12

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Stephan's Quintet (SQ, HCG92) was observed with the Far-Infrared Surveyor on board AKARI in four far-infrared (IR) bands at 65, 90, 140, and 160 mu m. The AKARI four-band images show far-IR emission in the intergalactic medium of SQ. In particular, the 160 mu m band image shows single peak emission in addition to the structure extending in the north-south direction along the shock ridge as seen in the 140 mu m band, H-2 emission, and X-ray emission. Whereas most of the far-IR emission in the shocked region comes from the cold dust component, shock-powered [C II] 158 mu m emission can significantly contribute to the emission in the 160 mu m band that shows a single peak at the shocked region. In the shocked region, the observed gas-to-dust mass ratio is in agreement with the Galactic one. The color temperature of the cold dust component (similar to 20 K) is lower than that in surrounding galaxies (similar to 30 K). We discuss a possible origin of the intergalactic dust emission.

引用

页数：5

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