IAU00769
Presentation type requested: POSTER
FLUCTUATION OF THE SUBMM BACKGROUND FROM FORMING GALAXIES
Motohiro Enoki
Osaka university
We constructed a new model of galaxy evolution, which is based on the hierarchical clustering scenario and the chemical evolution theory of galaxies. By its construction our model includes the formation of dark halos and the evolution of baryonic structures in a quite simple but consistent way. Using this model, we predict the fluctuation of cosmological background radiation at submillimeter wavelengths from forming galaxies. Because the small grain sizes in young metal-poor galaxies make the appearance of their infrared spectral energy distribution (SED) quite different from that of nearby older galaxies, we adopt a model for the evolution of dust content and the infrared SED of low-metallicity, extremely young galaxies. This SED model, together with the dark halo mass function and halo bias model, enables us to investigate theoretically the properties of the angular correlation function of cosmological background radiation at submillimeter and millimeter wavelengths from forming galaxies. Comparing our predictions with forthcoming future observations will provides crucial information to constrain the physical processes of galaxies in their formation phase. It is also useful for the construction of observational strategies by the facilities like ALMA.
Takeuchi Tsutomu T, Ishii Takako T
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