Mathematics – Logic
Scientific paper
Nov 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sacm.confe..30g&link_type=abstract
The Starburst-AGN Connection under the Multiwavelength Limelight, held 14-16 September 2011. Published online at http://www.scio
Mathematics
Logic
Scientific paper
LIRGs and ULIRGs are believed to be some of the most actively star forming systems in the local universe. Although AGN may contribute to the heating of the dust in some of them, especially those with warm far-IR colours, it is believed that much of the far-IR excess in these objects represents reprocessed starlight. Moreover, the LIRGs-ULIRGs invariably show morphological features suggestive of mergers such as tidal tails and double nuclei. The fact that the luminous AGN are more prevalent in warm than in cool LIRGs-ULIRGs has led Sanders et al. to suggest that cool LIRGs-ULIRGs evolve into warm LIRGs-ULIRGs on their way to becoming quasars (QSOs). We investigate the properties of the stellar population (age, mass, reddening) in a sample of LIRGs-ULIRGs to understand the link between star formation and AGN activity in the merger process. Using the starburst ages as a clock we determine: (a) whether LIRGs-ULIRGs evolve into quasars; (b) whether cool LIRGs-ULIRGs evolve into warm LIRGs-ULIRGs; and (c) whether the merger sequence deduced from morphological studies is reflected in the properties of the young stellar population. This investigation is crucial to find out whether an evolutionary link exists between LIRGs-ULIRGs, and QSOs, and normal elliptical galaxies, and understanding the evolution of stellar populations as the mergers progress.
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