On the degree of dust extinction in major mergers

Details On the degree of dust extinction in major mergers On the degree of dust extinction in major mergers

2000-08-18

arxiv.org/abs/astro-ph/0008289v1

Astronomy and Astrophysics

Astrophysics

11 pages 8 (2 jpg) figures accepted by A&A

Scientific paper

We numerically investigate how fundamental properties of the spectral energy distribution (SED) of a major gas-rich galaxy merger with dusty starburst are determined by the initial orbital configuration of the merger. We found that an infrared luminous galaxy with dusty starburst formed by a nearly retrograde-retrograde merger suffers the most remarkable dust extinction of stellar light and consequently shows very red colors. Considering that a retrograde-retrograde merger does not produce strong and long tidal tails, this result suggests that a luminous infrared galaxy without clear signs of interaction and merging shows very large internal dust extinction and redder colors.These numerical results furthermore imply that the morphology of a luminous infrared galaxy can correlate with the degree of internal dust extinction and thus with the shape of the SED, principally because the morphology of a merger also depends strongly on the initial orbital configuration of the merger.

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