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We present a detailed comparison of the CO(3-2) emitting molecular gasbetween a local sample of luminous infrared galaxies (U/LIRGs) and a highredshift sample that comprises submm selected galaxies (SMGs), quasars, andLyman Break Galaxies (LBGs). The U/LIRG sample consists of our recent CO(3-2)survey using the Submillimeter Array while the CO(3-2) data for the highredshift population are obtained from the literature. We find that theL(CO(3-2)) and L(FIR) relation is correlated over five orders of magnitude,which suggests that the molecular gas traced in CO(3-2) emission is a robusttracer of dusty star formation activity. The near unity slope of 0.93 +/- 0.03obtained from a fit to this relation suggests that the star formationefficiency is constant to within a factor of two across different types ofgalaxies residing in vastly different epochs. The CO(3-2) size measurementssuggest that the molecular gas disks in local U/LIRGs (0.3 - 3.1 kpc) are muchmore compact than the SMGs (3 - 16 kpc), and that the size scales of SMGs arecomparable to the nuclear separation (5 - 40 kpc) of the widely separatednuclei of U/LIRGs in our sample. We argue from these results that the SMGsstudied here are predominantly intermediate stage mergers, and that the widerline-widths arise from the violent merger of two massive gas-rich galaxiestaking place deep in a massive halo potential.

astrophysical journal/the astrophysical journal

Luminous Infrared Galaxies with the Submillimeter Array: II. Comparing  the CO(3-2) Sizes and Luminosities of Local and High-Redshift Luminous  Infrared Galaxies