Physics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20589l&link_type=abstract
Spitzer Proposal ID #20589
Physics
Scientific paper
We propose a study of Luminous and Ultra-Luminous Infrared galaxies (LIRGs and ULIRGs, respectively) to investigate their energy generating mechanisms and the role played by interactions and mergers in their evolution. These galaxies are gas-rich systems with infrared luminosities in the range log(L_IR) = 11- 12. These systems are mainly found in interacting pairs or groups and most of them have indications of a recent, past or ongoing merger or interaction. Despite the many advances in understanding these galaxies, many questions remain: (i) What is the relative frequency of AGNs and starburst in LIRGs and ULIRGs?, (ii) Is the number of AGN-ULIRGs a function of the infrared luminosity?; (iii) Is the nuclear separation in these galaxies a determinant factor in the appearance of an AGN? To answer these question we propose a IRS spectroscopic survey of 28 LIRGs and ULIRGs in different merger or interaction stages. The plan is to use the low resolution modes of IRS (SL and LL) to cover the 5.2 to 38 um wavelenght range. This wavelength region is rich in high ionization lines and PAH features which can be used as diagnostic indicators of the main energy source in these galaxies: AGN or massive star formation.
Leao Joao
Leitherer Claus
Souza Leao Joao Rodrigo
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