Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-01-04
Astronomy and Astrophysics
Astrophysics
To appear in the proceedings of: "The Spectral Energy Distribution of Gas-Rich Galaxies: Confronting Models with Data", Heidel
Scientific paper
10.1063/1.1913963
We investigate the cold and warm dust properties during galaxy interactions using a merging galaxy sample ordered into a chronological sequence from pre- to post-mergers. Our sample comprises a total of 29 merging systems selected to have far-infrared and sub-millimeter observations. We use the 100-to-850 micron flux density ratio, f100/f850, as a proxy to the mass fraction of the warm and the cold dust in these systems. We find evidence for an increase in f100/f850 along the merging sequence from early to advanced mergers and interpret this trend as an increase of the warm relative to the cold dust mass. We argue that the two key parameters affecting the f100/f850 flux ratio is the star-formation rate and the dust content of individual systems relative to the stars. Using a sophisticated model for the absorption and re-emission of the stellar UV radiation by dust we show that these parameters can indeed explain both the increase and the observed scatter in the f100/f850 along the merging galaxy sequence.
Charmandaris Vassilios
Georgakakis Antonis
Misiriotis Angelos
Xilouris Emmanuel M.
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