Mathematics – Logic
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21332306k&link_type=abstract
American Astronomical Society, AAS Meeting #213, #323.06; Bulletin of the American Astronomical Society, Vol. 41, p.379
Mathematics
Logic
Scientific paper
Luminous and ultraluminous infrared galaxies are thought to play an important role as a transition stage in galaxy evolution. The unique combination of depth and breadth in the COSMOS field allows us to probe this role in a statistically unprecedented way. Here we present the results of our study of a flux-limited sample of 70 micron selected infrared galaxies in the COSMOS field. Using the vast multiwavelength dataset available, we construct the full SEDs and fit templates to determine the total infrared luminosity for each source in the sample. We then study the morphological properties of our sources to determine the fraction of major and minor mergers as a function of luminosity and U-V color. We find that the merger fraction correlates strongly with luminosity and that these sources do not follow the same color dichotomy as normal galaxies but instead peak in the green valley. This suggests that these sources represent a transition stage in galaxy evolution between star-forming spirals and passive ellipticals. Finally, we combine the x-ray and radio detections of our sources with optical line diagnostics to determine the AGN fraction of our sample as a function of luminosity.
Kartaltepe Jeyhan S.
S-COSMOS Team
Sanders David B.
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