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Letter to the Editor
Mid-infrared spectroscopy of the hyperluminous infrared galaxy IRAS P09104+4109 *
Y. Taniguchi ,
Y. Sato 1, 2,
K. Kawara 1,
T. Murayama 3, 4 and
H. Mouri 1, 5
Received 25 October 1996 / Accepted 26 November 1996
We present mid-infrared spectroscopy of the hyperluminous infrared galaxy IRAS 09104+4109 based on observations with ISOCAM CVF. We have detected the emission peak around 8 µm as well as the absorption feature around 10 µm possibly due to silicate, providing evidence for a dusty torus around the central engine. Comparing the observational results with the dusty torus model studied by Pier & Krolik (1992), we show that the most mid infrared emission comes from a compact (a few pc in radius) dusty torus although the excess far infrared emission suggests the presence of an extended dusty torus with radius of 100 pc.
Key words: hyperluminous infrared galaxy (IRAS P09104+4109) active galactic nuclei infrared emission
* Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands, and the United Kingdom) and with the participation of ISAS and NASA.
Send offprint requests to: Y. Taniguchi
Online publication: July 8, 1998