Physics
Scientific paper
Feb 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sgyu.conf..125s&link_type=abstract
Studies of Galaxies in the Young Universe with New Generation Telescope, Proceedings of Japan-German Seminar, held in Sendai, Ja
Physics
Scientific paper
By performing N-body simulations of chemodynamical evolution of galaxies with dusty starbursts, we investigate photometric evolution of gas-rich major mergers in order to explore the nature of ultraluminous infrared galaxies (ULIRGs) with the total infrared luminosity (L IR for 8 ˜ 1000 μm) of ˜ 1012 L&sun;. Main results are the following five. (1) Global colors and absolute magnitudes the during dusty starburst of a major merger do not change with time significantly. (2) Dust extinction of stellar populations in a galaxy merger with large infrared luminosity (LIR > 1011 L&sun;) is selective in the sense that younger stellar populations are preferentially obscured by dust than old ones. (3) LIR, the ratio of LIR to LB and the dust temperature Tdust increase with the increase of the star formation rate. (4) The star formation efficiency, total gas mass, the degree of dust extinction (AV), Tdust, LIR, and LIR/LB depend strongly on the separation of two cores of the merger. (5) The two-dimensional distribution of global colors (e.g., R-K) shows a negative color gradient during starburst. Our numerical results clearly demonstrate that dynamical processes of major galaxy merging, which can control the time evolution of the relative spatial distribution of dusty interstellar gas and young stars, play a vital role in determining photometric properties of ULIRGs.
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