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Energy Sources of Ultraluminous Infrared
Galaxies
Masatoshi IMANISHI
Division of Optical and Infrared Astronomy,
National Astronomical Observatory
Abstract : Ultraluminous
infrared
galaxies
(ULIRGs), discovered with the IRAS all sky
survey, radiate quasar-like luminosities (L
1012Lῌ) as infrared dust emission, and thus
possess extremely powerful energy sources hidden
behind dust. However, the most important issue,
namely, whether the dominant energy sources of
ULIRGs are dust-obscured AGNs or starbursts,
is still unclear. In this article, I review the
current understanding of the energy sources of
nearby ULIRGs, based on our thermal infrared
spectroscopy using Subaru and Spitzer, as well as
millimeter and X-ray observations.
2005 6