NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-07-18 T20:10:55 PDT
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For refcode 2011ApJ...731L..12S:
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2011ApJ...731L..12S Far-infrared Emission from the Intergalactic Medium in Stephan's Quintet Revealed by AKARI Suzuki, Toyoaki; Kaneda, Hidehiro; Onaka, Takashi; Kitayama, Tetsu Abstract. 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 micron. The AKARI four-band images show far-IR emission in the intergalactic medium of SQ. In particular, the 160 micron 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 micron 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 micron emission can significantly contribute to the emission in the 160 micron 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. Key words: galaxies: clusters: individual: Stephan's Quintet, galaxies: interactions, infrared: ISM, ISM: structure
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