Far-infrared Emission from the Intergalactic Medium in Stephan's Quintet Revealed by AKARI
Far-infrared Emission from the Intergalactic Medium in Stephan's Quintet Revealed by AKARI
复制标题
AKARI 揭示了史蒂芬五重奏中星际介质的远红外发射
DOI：
10.1088/2041-8205/731/1/l12
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
T.
中科院分区：
文献类型：
--
作者：
Suzuki;T.;Kaneda;H.;Onaka;T.;Kitayama;T.
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 μm. The AKARI four-band images show far-IR emission in the intergalactic medium of SQ. In particular, the 160 μm 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 μm 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 μm emission can significantly contribute to the emission in the 160 μm 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 (∼ 20 K) is lower than that in surrounding galaxies (∼ 30 K). We discuss a possible origin of the intergalactic dust emission.
